In the diagram below, the area of $\triangle BCD$ is 60. What is the length of side $\overline{BC}$?
1 answer:
Area of triangle = 1/2 bh
60 = 1/2 (15) h
8 = h
Quadrilateral area = h x (b1 + b2)/2 = 8 x (15+9)/2 = 96 sq units
96 -60 = triangle BAD area = 36 sq units
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