If you have triangle ABC and angle C is 90 degrees, which of the following must be true? sin A = sin B
cos A = sin B
tan A = tan B
sin A = tan B

false

step-by-step explanation:

false.   two legs of the trapezoid would be congruent, but the other two would not.   were all the legs congruent, then we'd have a square; were the 2 shorter sides congruent and the 2 longer sides also congruent, we'd have a rectangle.