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OpenStudy (vera_ewing):
Write an equation that could be used to find the the measure of angle R. A. 142 = 162 + 102 – 2(16)(10)(cos R) B. 102 = 142 + 162 – 2(14)(16)(cos R) C. 162 = 142 + 102 – 2(14)(10)(cos R) D. 162 = 142 + 102 – 2(5)(6)(cos R)
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