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3 years ago

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

2 answers:

7 0

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<span />

Vladimir [108]3 years ago

3 0

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

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Missing part of the question

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Answer:

$S_n = \frac{n}{2}(n - 1)$

Step-by-step explanation:

Given

For 5 people

$\begin{array}{cc}{People} & {Handshakes} & {5} & {4} & {4} & {3} & {3} & {2} & {2} & {1} & {1} & {0} &{Total} & {10} \ \end{array}$

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Where

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$S_n = \frac{n}{2}(n - 1)$

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3 years ago

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Step-by-step explanation:

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