Problem 501.
Triangle, Two Squares, Center, Midpoint, another Square.

Problem 502.
Triangle, Two Squares, Midpoint, Perpendicular, Half the measure.

Problem 503.
Triangle with Three Squares, Perpendicular, Congruence, Concurrency.

Problem 504.
Equilateral Triangle, Angles, 45, 60 Degrees.

Problem 505.
Right Triangle, Cevian, Sum of Segments, Angles.

Problem 506.
Triangle with Three Squares, Center, Midpoint, Perpendicular.

Problem 507.
Triangle, Interior Point, 120 Degrees, Congruence, Angle.

Problem 508.
Triangle with three Squares, Four triangle of equal Area.

Problem 509.
Triangle, 120 Degrees, Angles, Congruence, Mind Map.

Problem 510.
Triangle, Three Squares, Midpoints, Concurrency.