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Back to Derive triangle area formula — Problem 2 · Task Set 22

Exercises: Derive the Formula A = (1/2)ab sin(C)

Grade 10·21 problems·~30 min·Common Core Math - HS Geometry·standard·hsg-srt-d-9
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A

Fluency Practice

1.

Find the area of a triangle with sides a=5a = 5 cm and b=7b = 7 cm and included angle C=60°C = 60\degree. Use sin⁡(60°)≈0.866\sin(60\degree) \approx 0.866. Round to the nearest tenth.