In a trapezoid with perpendicular diagonals, the length of a diagonal is 5 and the length of the altitude of the trapezoid is 4. Find the area of the trapezoid.
I have tried using similar triangle properties and using pythagorean theorem but have found no solution. I tried using triangle BPC ~ triangle APD but didn't know where to go after that.
UPDATE: I have gotten to the point using the definition of the height of a triangle and the pythagorean theorem. But I don't know how to find the area of the top left triangle.enter image description here
I used the fact that ACF and ABC are congruent by ASA so I got the area of the trapezoid is 38 but I'm not sure if that is right