Geometry Problems 1381-1390. Level: High School, College

Geometry Problems 1381 - 1390

Geometry Problem 1381.
Parallelogram, Exterior Point, Triangle, Area.

Conformal Mapping or Transformation of Geometry Problem 1381.

Poster of Geometry Problem 1381.

Geometry Problem 1382.
Circle, Diameter, Radius, Perpendicular, Congruence.

Conformal Mapping or Transformation of Problem 1382.

Geometry Problem 1383.
Triangle, Median, Circle, Chord, Secant, Sum, Product.

Geometry Problem 1384.
Triangle, Orthocenter, Circle, Circumcircle, Angle Bisector, 90 Degree.

Geometry Problem 1385.
Triangle, Orthocenter, Circle, Circumcircle, Angle Bisector, Midpoint, Collinear Points.

Geometry Problem 1386.
Thabit ibn Qurra (826 -901) Theorem and more conclusions, generalized Pythagorean Theorem to any triangle.

Conformal Mapping or Transformation of Problem 1386.

Geometry Problem 1387.
Quadrilateral, Double Angle, Congruence, Isosceles Triangle.

Geometry Problem 1388.
Triangle 40-60-80 degree, Incenter, Congruence.

Geometry Problem 1389.
Triangle, 40-120-20 degree, Angle, Congruence.

Poster of Geometry Problem 1389.

Geometry Problem 1390.
Triangle, any point, perpendicular, sum of the squares.