Answer:
135ft^2
Explanation:
area of trapzoid= (a+b)/(2)×h
area of traingle= 1/2(b)(h)
area of the shaded region equals (a+b)/(2)×h-1/2(b)(h)
so
(8+18)/(2)×15-(1/2)(8)(15)
=135ft^2
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