# Online Geometry Theorems and Problems. College, High School

 Geometry - Recent Additions (1/15) Geometry Problem 1324. Quadrilateral, Diagonal, 45 Degrees, Angle Bisector, Isosceles Triangle, Congruence. Geometry Problem 1323. Square, Angle Trisector, Diagonal, Regular Dodecagon, Area, 30-60 degrees. Geometry Problem 1322. Triangle, Angle Bisector, Circumcircle, Chord, Secant, Sum of two Angles. Geometry Problem 1321. Intersecting Circles, Diameter, Secant, Chord, Collinearity. Geometry Problem 1320. Triangle, Incircle, Tangent, Chord, Circle, Parallel, Perpendicular, Collinearity. Geometry Problem 1319. Hexagons, Equilateral Triangles, Center, Midpoints. Geometry Problem 1318. Rectangle, Equilateral Triangle, Distances, Perpendicular, Measurement. Geometry Problem 1317. Triangle, Excircle, Chord, Tangent, Midpoint, Arc, Sum of two Segments, Congruence. Geometry Problem 1316. Triangle, Incircle, Tangent, Chord, Midpoint, Sum of two Segments, Congruence. Geometry Problem 1315. Triangle, Incircle, Tangent, Chord, Circle, Congruence. Geometry Problem 1314. Equilateral Triangle, Incircle, Inscribed Circle, Tangent, Congruence. Geometry Problem 1313. Regular Decagon, Pentadecagon, Equilateral Triangle, Congruence. Geometry Problem 1312. Triangle, 60 Degrees, Circle, Circumcenter, Orthocenter, Altitude, Distance, Perpendicular, Measurement. Geometry Problem 1311. Inscribed Triangle, Circle, Circumcircle, Concyclic Points, Measurement. Geometry Problem 1310. Square, Center, Right Triangle, Area, Measurement. Geometry Problem 1309. Triangle, Circle, Inradius, Excircle, Tangent, Exradius, Measurement. Geometry Problem 1308. Quadrilateral, Diagonal, Triangle, Tangent Line, Sides, Measurement. Geometry Problem 1307. Triangle, Incenter, Parallel line, Sides, Measurement. Geometry Problem 1306. Cyclic, Inscribed Quadrilateral, Circle, Tangent, Diagonals, Collinear Points. Geometry Problem 1305. Triangle, Circumcircle, Angle Bisector, Arc, Perpendicular, Area. Geometry Problem 1304. Triangle, 120 Degrees, Angle Bisector, Measurement. Geometry Problem 1303. Triangle, 60 Degrees, Angle Bisector, Measurement. Geometry Problem 1302. Triangle, Median, Midpoint, Circles, Diameters, Congruence. Geometry Problem 1301. Arbelos, Semicircles, Diameters, Circle, Incircle, Incenter, Square, Midpoint, Concurrency. Geometry Problem 1300. Arbelos, Semicircles, Diameters, Circle, Incircle, Tangent, Perpendicular, Concurrent Lines. Geometry Problem 1299. Triangles, Interior Point, Angles, 30 degrees. Geometry Problem 1298. Arbelos, Semicircles, Diameters, Circle, Incircle, Tangent, Angle Bisector, Perpendicular, Midpoint. Geometry Problem 1297. Arbelos, Semicircles, Diameters, Tangent, Angle Bisector. Geometry Problem 1296.Heron's Formula, Area of a triangle in terms of the three medians. Geometry Problem 1295. Right Triangle, Incenter, Incircle, Excenter, Excircle, Congruence, Angle. Geometry Problem 1294. Triangle, Altitudes, Four Squares, Center, Midpoint, Concyclic Points. Geometry Problem 1293. Triangle, Altitudes, Two Squares, Center, Concurrent Lines, Midpoint. Geometry Problem 1292. Square, Circle, Right Triangle, Arc, Inradius, Radius, Incircle, Measurement. Geometry Problem 1291. Three Squares, Collinear Vertices, Midpoint, Congruence. Geometry Problem 1290. Triangle, Internal Angle Bisector, Median, Parallel, Measurement, Metric Relations. Geometry Problem 1289. Triangle, Cevian, Concurrency, Measurement, Metric Relations. Geometry Problem 1288. Triangle, 30-50-100 Degrees, Area, Inradius, Metric Relations, Measurement. Geometry Problem 1287. Triangle, 40-100-40 Degrees, Congruence, Area, Metric Relations, Measurement. Geometry Problem 1286. Triangle, Quadrilateral, 60, 135, 105 Degree Angles, Congruence, Measurement. Geometry Problem 1285. Triangle, Quadrilateral, 60, 150, 90 Degree Angles, Congruence, Measurement. Geometry Problem 1284. Two Equilateral Triangle, Perpendicular, Midpoint, Congruence. Geometry Problem 1283. Two Equilateral Triangle, Perpendicular, Midpoint. Geometry Problem 1282. Three Squares, Common Vertex, Midpoint, Perpendicular, 90 Degrees. Geometry Problem 1281. Triangle, Circle, Diameter, Tangent, Altitude, Congruent Angles. Geometry Problem 1280. Quadrilateral, Perpendicular Diagonals, Isosceles Right Triangles, 45 Degrees, Collinear Points. Geometry Problem 1279. Parallelogram, Midpoint, Triangle, Area, 3/10. Geometry Problem 1278. Square, 3-4-5 Right Triangle, Midpoint.

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