To find the area of the given diagram use the formula:
A = 1/2(b1 + b2)(h)
b1 and b2 are the bases.
First we need to find the total length of the second base:
7 + 3 = 10
Now apply the formula:
A = 1/2(7 + 10)(6)
A = 1/2(17)(6)
A = 51 in²
Hope this helps :)