Question

The figure below shows AB = 5 units and BD = 7 units.



If the area of triangle ADE is 40 square units, what is the area of the trapezoid BCED?

Answer 1

@dymium

Answer 2

the length of the small triangle is (5/12) of the big (enclosing) triangle
so its area is (5/12)^2 times the area of the big triangle
if we subtract off the area of the small triangle we get the area of the trapezoid
so the area of the trapezoid is
40 - (25/144)*40 = 40*119/144 = 33 1/18

Answer 3

one sec

Answer 4

I got 36.18 from this one