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Online Geometry Theorems and Problems. College, High School
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Geometry - Recent
Additions
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Geometry Problem 1433.
Tangent Circles, Diameter, Perpendicular, Midpoint, Measurement,
Poster Typography, iPad Apps. |
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Geometry Problem 1432.
Tangent Circles, Secant, Tangent Lines, Proportionality, Similarity,
Poster Typography, iPad. |
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Geometry Problem 1431.
Triangle, Circumcircle, Parallel Chord, Apollonius, LLC, Congruent Angles, Poster, Conformal Mapping. |
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Geometry Problem 1430. Regular Octagon, Area, Equivalent Figures,
Poster, Conformal Mapping. |
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Geometry Problem 1429. Triangle, Median, 15-30 degree, Angle, Congruence. |
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Geometry Problem 1428. Intersecting Circles, Tangent Line, Triangle, Square, Area. |
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Geometry Problem 1427. Circle inscribed in a square, Arc, Tangent Line, Tangent Circles, Radii. |
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Geometry Problem 1426. Two Squares, Collinear Points, Triangle, Quadrilateral, Sum of the Areas. |
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Geometry Problem 1425. Two Squares, Collinear Points, Concurrent Lines. |
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Geometry Problem 1424. Triangle, Parallelogram, Trapezoid, Area, Diagonal, Measurement. |
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Geometry Problem 1423. Triangle, Area, Three Equal Angles, Circumradius, Measurement. |
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Geometry Problem 1422. Triangle, Transversal, Cevian, Area, Measurement. |
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Geometry Problem 1421. Right Triangle, Incircle, Excircle, Tangent Lines, Measurement. |
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Geometry Problem 1420. Regular Hexagon, Inscribed Circle, Area, Tangent
Circles, Tangent Line. |
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Geometry Problem 1419. Triangle, Altitude, Circumcircle, Incenter, Inradius, Perpendicular, Angle Bisector, Midpoint. |
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Geometry Problem 1418. Triangle, Circumcircle, Incenter, Side, Sum of Segments, Tangent, Parallel, Angle. |
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Geometry Problem 1417. Triangle, Cevian, Circumcircle, Incenter, Perpendicular, Angle Bisector,
Tangent Lines, Tangent Circles. |
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Geometry Problem 1416. Right Triangle, Altitude, Incircle, Excircle, Tangency Points, 45 Degree Angle. |
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Geometry Problem 1415. Right Triangle, Altitude, Incircle, Excircle, Tangency Points, Isosceles Triangle. |
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Geometry Problem 1414. Right Triangle, Altitude, Incircle, Excircle, Tangency Points, Isosceles Triangle. |
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Geometry Problem 1413. Right Triangle, Incircle, Excircle, Tangency Points,
Isosceles Right Triangle. |
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Geometry Problem 1412. Right Triangle, Incircle, Excircle, Tangency Points,
45 Degree Angle. |
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Geometry Problem 1411. Right Triangle, Incircle, Excircle, Tangency Points,
Isosceles Right Triangle. |
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Geometry Problem 1410. Right Triangle, Incircle, Excircle, Tangency Points,
45 Degree Angle. |
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Geometry Problem 1409. Right Triangle, Incircle, Excircle, Collinear Tangency Points, Collinearity. |
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Geometry Problem 1408. Right Triangle, Incircle, Excircle, Incenter, Midpoint, Tangency Point, Collinearity. |
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Geometry Problem 1407. Right Triangle, Incircle, Excircle, Collinear Tangency Points, Collinearity. |
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Geometry Problem 1406. Four Congruent Circles, Measurement, Metric Relations,
Sum of the Squares. |
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Geometry Problem 1405. Four Congruent Circles, Congruent Chords. |
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Geometry Problem 1404. Three Circles, Center, Intersecting Points, Collinearity, Congruence. |
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Geometry Problem 1403. Quadrilateral, 90 Degree Angle, Perpendicular, Congruence. |
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Geometry Problem 1402. Triangle, Three Tangent Circles, Parallel Diameter, Collinear Points. |
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Geometry Problem 1401. Right Triangle with three circles on the sides, Isosceles, Diameter, Center, Tangent, Congruence. |
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Geometry Problem 1400. Triangle with three rectangles on the sides, Perpendicular Bisectors, Concurrency. |
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Geometry Problem 1399.
Triangle, Circumcircle, Perpendiculars, Angles, Congruence, Cyclic Quadrilateral. |
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Geometry Problem 1398.
Isosceles Triangle, Circle, Radius, Perpendicular, Measurement. |
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Geometry Problem 1397. Circle, Diameter, Tangent, Secant, 90 Degrees Angle,
Perpendicular, Collinear Points. |
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Geometry Problem 1396. Triangle with three rectangles on the sides, Vertices, Perpendicular lines, Concurrency. |
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Geometry Problem 1395. Triangle with three rectangles on the sides, Midpoints, Perpendicular lines, Concurrency. |
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Geometry Problem 1394. Three Circles and Three Pair of Common Internal Tangents, Concurrency. |
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Geometry Problem 1393. Monge's Circle Theorem, Three Circles and Three Pair of Common Tangents, Collinearity. |
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Geometry Problem 1392. Two Cyclic Quadrilateral, Cyclic Octagon, Circle. |
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Geometry Problem 1391. Two Triangles, Ratio of Areas, Circumcircle. |
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Geometry Problem 1390. Triangle, any point, perpendicular, sum of the squares. |
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Geometry Problem 1389. Triangle, 40-120-20 degree, Angle, Congruence. |
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Geometry Problem 1388. Triangle 40-60-80 degree, Incenter, Congruence. |
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Geometry Problem 1387. Quadrilateral, Double Angle, Congruence, Isosceles Triangle. |
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Geometry Problem 1386. Thabit ibn Qurra (826 -901) Theorem and more conclusions, generalized Pythagorean Theorem to any triangle. |
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Geometry Problem 1385. Triangle, Orthocenter, Circle, Circumcircle, Angle Bisector, Midpoint, Collinear Points. |
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Geometry Problem 1384. Triangle, Orthocenter, Circle, Circumcircle, Angle Bisector, 90 Degree. |
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Geometry Problem 1383. Triangle, Median, Circle, Chord, Secant, Sum, Product. |
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Geometry Problem 1382. Circle, Diameter, Radius, Perpendicular, Congruence. |
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Geometry Problem 1381. Parallelogram, Exterior Point, Triangle, Area. |
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Geometry Problem 1380. Common
Internal Tangents. Circles, Secant, Congruent Chords. |
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Geometry Problem 1379. Common External Tangents. Circles, Secant, Congruent Chords. |
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Geometry Problem 1378. Parallelogram, Diagonal perpendicular to a side, Distances from a Point to Vertices, Measurement. |
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Geometry Problem 1377. Isosceles Triangle, Interior Cevian, Equal Sum of Exradii, Excircle. |
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Geometry Problem 1376. Isosceles Triangle, Interior Cevian, Excircles, Tangency Points, Parallel Lines. |
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Geometry Problem 1375. Isosceles Triangle, Interior Cevian, Exradius, Excircle, Altitude to the Base. |
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Geometry Problem 1374. Isosceles Triangle, Exterior Cevian, Incircle, Excircle, Tangency Points, Parallel Lines. |
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Geometry Problem 1373. Isosceles Triangle, Exterior Cevian, Inradius, Exradius, Altitude to the Base. |
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Geometry Problem 1372. Equilateral Triangle, Exterior Cevian, Inradius, Exradius, Altitude, Sketch, iPad Apps. |
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Geometry Problem 1371: Equilic
Quadrilateral 5. |
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Geometry Problem 1370: Equilic
Quadrilateral 4 |
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Geometry Problem 1369: Equilic
Quadrilateral 3 |
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Geometry Problem 1368: Equilic
Quadrilateral 2 |
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Geometry Problem 1367: Equilic
Quadrilateral 1 |
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Geometry Problem 1366.
Square, Angle Bisector, Perpendicular, Concyclic Points, Circle, Sketch, iPad Apps. |
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Geometry Problem 1365.
Circle, Tangent, Secant, Chord, Parallel, Midpoint, Sketch, iPad Apps. |
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Geometry Problem 1364.
Square, Inscribed Circle, Area, Angle Bisector, Perpendicular, 45 Degrees, Sketch, iPad Apps. |
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Geometry Problem 1363.
Square, Angle Bisector, Perpendicular, 45 Degrees, Angle, Sketch, iPad Apps. |
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Geometry Problem 1362.
Equilateral Triangle Inscribed in a Circle, Lunula, Ratio of Areas, Tangent, Sketch, iPad Apps. |
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Geometry Problem 1361.
Triangle, Two Nine-Point Circles, Feuerbach's Circle, Euler's Circle, Congruent Angles, Sketch, iPad Apps. |
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Geometry Problem 1360.
Triangle, Nine-Point Circle, Feuerbach's Circle, Euler's Circle, Cyclic Quadrilateral, Concyclic Points, Sketch, iPad Apps. |
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Geometry Problem 1359.
Triangle, Circumcircle, Congruent Angles, Midpoints. |
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Geometry Problem 1358.
Regular Dodecagon, Diagonals, Concurrency, Points, Lines. |
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Geometry Problem 1357.
Regular Dodecagon, Diagonals, Concurrency, Collinearity, Points, Lines. |
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Geometry Problem 1356.
Quadrilateral, Triangle, Angle, 30 Degrees, Congruence. |
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