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Use any method you like to find the measure of angle A
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Use any method you like to find the measure of angle A

Use any method you like to find the measure of angle A-example-1
User Sirandy
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1 Answer

6 votes
A = 71.5 degrees (1 dp)

cos(A) = (21^2 + 16^2 - 22^2) / (2 x 21 x 16)
= 0.31696...
A = cos^-1(0.31696...) = 71.5 degrees
User Joe Berthelot
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