The line down the middle seems to be a perpendicular bisector. that means that we've got to multiply 36 times two, which is 72 and multiply it times 25, and divide that result by two since the formula for a triangle is 1/2 times base times the height. I would not count on this however. To have a more exact result, I would use Pythagorean theorem to find the third side of the triangle on the right to then apply the area of a triangle formula, which would be:
