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09-11-2021
Mathematics

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In ΔABC, a = 260 inches, b = 480 inches and c=430 inches. Find the measure of ∠C to the nearest 10th of a degree.

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09-11-2021

By the cosine rule

430^2 = 260^2 + 480^2 - 2(260)(480)cos(C)

C = arccos([260^2 + 480^2 - 430^2]/2(260)(480)

C = 63.1 degrees (nearest tenth of a degree)

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