The area of a trapezoid is given by the formula A = (1/2)(b₁ +b₂)×h Fill in the given information and solve for h. 39 cm² = (1/2)(12 cm +(12 cm +2 cm))×h 39 cm²/(13 cm) = h = 3 cm
The given info gives you two pairs of congruent angles. Side RS is the included side. It is a side of both triangles, and it is congruent to itself. Since you now have side RS congruent to side RS, you can use ASA.