3 years ago

In the diagram below, the area of $\triangle BCD$ is 60. What is the length of side $\overline{BC}$?

Mathematics

1 answer:

Phantasy [73]3 years ago

8 0

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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denpristay [2]

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so maybe just multiply by 3 and get 309 since B, C, and D are three angles.
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