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angle4dRelated Triangle | Pythagorean Theorem . Rht triangle. A rht triangle is a type of triangle that has one angle that measures 90°. Rht triangles, and the relationshipsAn Isosceles trapezoid, as shown above, has left and rht sides of equal length that join to the base at equal angles.. The Kite. Hey, it looks like a kite (usually).. It has two pairs of sides:.