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18 July, 03:26

In a right triangle ABC, tan (a) = 20/21. find sin (a) and cos (a)

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  1. 18 July, 05:58
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    Sin (a) = opposite/hypotenuse

    ∴hypotenuse=√20²+21²

    =√400+441

    =√841

    =29

    ∴sin (a) = 20/29

    =0.6897

    cos (a) = adjascent/hypotenuse

    =21/29

    =0.7241
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