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21 April, 22:04

A right triangle has the hypotenuse c = 12 cm and an angle A = 30°. Find the length of side a, which is opposite angle A. A. 7.4 cm B. 4 cm C. 2.5 cm D. 6 cm

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  1. 21 April, 22:17
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    On the one hand we know that sin (30) = 1/2. On the other hand we know that sin (A) = a/c. From these two relations we obtain that 1/2 = a/c 1/2 = a/12 a = 12*1/2 a = 6. So the answer is D. 6cm.
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