It's very simple.
Two identical triangles with side lengths of 125 cm, 132 cm, and 37 cm form a parallelogram ABCD.
Heron's formula gives the area of a triangle when the length of all three sides is known.
A = sqrt[s(s - a)(s - b)(s - c)] ( s => semiperimeter ) s = 1/2(a + b + c)