Help explaining pre-algebra :(?

Courtinee

New member
ok there is a square, a rectangle, a Rhombus, and a trapezoid. They are all divided into triangles, ok? The Question is which of the figures are always divided into congruent triangles by the diagonal?
A.Only the squar and rectangle
B.Only the rhombas, and trapezoid
C.Only the square,rectangle, and rhombas
D.only the rectangle,rhombas, and trapezoid.
I know the answer is C. But how do i explain My answer? 10 points to the best explaination! :)
*they are all divided into 2 triangles.
 
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