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

User Matthew Manela
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6.1k points

2 Answers

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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
User Peter Albert
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5.2k points
4 votes

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

User IAteYourKitten
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6.2k points
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