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02-01-2018
Mathematics

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In right triangle ABC, A and B are complementary angles and sin A = 8/9 . What is cos B? NextReset

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tynollette tynollette

02-01-2018

A and B are complementary, that means m∠A+m∠B=90
Recall that sinA=cos(90-A), if sinA=8/9, cos(90-A) is also 8/9
therefore, cosB=cos(90-A)=sinA=8/9

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mansoorahmedd67 mansoorahmedd67

24-10-2018

cos B is 8/9 too......................

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