In triangle ABC, angle C is 90 AC 3√21 BC 6 find sinA
| June 16, 2021 | education
1) sin A = BC / AB (because the sine is equal to the ratio of the opposite leg to the hypotenuse)
2) By the Pythagorean theorem, we find AB:
AB ^ 2 = BC ^ 2 + AC ^ 2
Hence:
AB ^ 2 = 36 + 189 = 225
AB = 15
3) sin A = 6 \ 15 = 0.4
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