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Back to Derive triangle area formula — Problem 4 · 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.

A triangle has sides a=6a = 6 m and b=8b = 8 m with included angle C=120°C = 120\degree. Find its area. Use sin⁡(120°)≈0.866\sin(120\degree) \approx 0.866. Round to the nearest tenth.