Answer:
C. 86 sq. units
Explanation:
You want the area of a polygon consisting of a 4 by 18 rectangle with equilateral triangles attached to the short sides.
Triangle area
The area of each of the two triangles is ...
A = 1/2bh
A = 1/2(4)(3.5) = 7 . . . . square units
Rectangle area
The area of the rectangle is ...
A = LW
A = (18)(4) = 72 . . . . square units
Polygon area
The area of the polygon is the area of two triangles plus the area of the rectangle:
A = 2(7) +72 = 86 . . . . square units
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