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What does X equal ????
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What does X equal ????

What does X equal ????-example-1
User Ben Sharpe
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1 Answer

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Rearrange the formula to get cos(A) = (b^2 + c^2 - a^2) / (2bc)
cos(X) = (20^2 + 18^2 - 22^2) / (2 x 20 x 18) = 0.33333...
X = cos^-1(0.3333...) = 70.5 degrees (1 dp)
User Ofirov
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