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11 September, 23:15

In triangle XYZ angle Y is a right angle and sinX=20/25. Find cosX in fraction and decimal form. Round to the nearest hundredth, if necessary.

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  1. 12 September, 02:49
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    A^2+B^2=C^2

    A-^2 + 20^2 = 25^2

    A^2 + 400 = 625

    Subtract 400 A^2 = 225

    A = 15 since sq rt of 225 is 15

    cos = 15/25 = 3/5=.6

    Answer 3/5 and decimal. 6
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