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angle4dA rht-angled triangle (also called a rht triangle)is a triangle with a rht angle (90) in it. ... The rht angled triangle is one of the most useful shapes in all ofAn 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:.