Given the following triangle, if c = 25 and a = 20°, find a.
0.34
8.6
9.1

8.6

Step-by-step explanation:

Sine is opposite/hypotenuse so you have

Sin20° = a/25.

To get a you have to multiply 25 to both sides of the equation to get

25 Sin20° = a

Find Sin20° on a calculator and you'll get approximately 0.3420

Then you multiply Sin20° by 25 and you'll get approximately 8.5505 which rounds to 8.6 which is a.

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