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Blinxen · Answer 1 · 2018-09-30T18:26:23+0000

a) sin 15° = (opposite side)/(hypotenuse)

sin 15° = x/20, but sin 15° = 0.25881
0.25881 = x/20 → x = 0.25881.(20) → x = 5.17

b) cos Ф° = adjacent side/hypotenuse

cos Ф° = 10/11 → cos Ф° = 0.9090.

cos⁻¹(0.9090) = Ф° → Ф° = 24.62°

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