Question

I have no idea how to do this problem:
http://tinypic.com/view.php?pic=m3ix2&s=6

Answer 1

First, calculate the area of the triangle (you know how to do that, I think).
The other part is a tarpazoid. You can calculate its area by realising it is comparable with a rectangle with sides 30 and (16+40)/2.
See the image:

Answer 2

tarpazoid = trapezoid :D