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In ΔQRS, q = 370 cm, r = 910 cm and ∠S=31°. Find the length of s, to the nearest centimeter.

 Mar 2, 2021
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law of cosines: s^2=q^2+r^2-2qr cos S

s^2=136900+828100-673400 $\cdot$ 0.8571 ≈ 387784

sqrt387784 ≈ $\boxed{623}$

 Mar 2, 2021

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