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Use the inverse of cosine to find the approximate interior angle measure at vertex A. Round your answer to the nearest whole degree.
a 17 b 15 c 8
(1 point)
A≈
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GPT-5 mini
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Use the law of cosines: a^2 = b^2 + c^2 − 2bc cos A.
So cos A = (b^2 + c^2 − a^2) / (2bc) = (225 + 64 − 289) / (2·15·8) = 0.
Thus A = cos⁻¹(0) = 90° (to the nearest degree).
So cos A = (b^2 + c^2 − a^2) / (2bc) = (225 + 64 − 289) / (2·15·8) = 0.
Thus A = cos⁻¹(0) = 90° (to the nearest degree).
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