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Use the law of cosines to find bc to the nearest tenth
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Use the law of cosines to find bc to the nearest tenth

Use the law of cosines to find bc to the nearest tenth-example-1
User Fady Sadek
by
4.2k points

1 Answer

4 votes

Answer:

28.9

Explanation:

a^2 = b^2 + c^2 − 2bc*cos(A)

a^2 = 23^2 + 21^2 − 2*23*21*cos(82)

(BC = a) (AC = b) & (AB = c)

a^2 = 529 +441 − 966*0.139173101

a^2 = 970 − 138.6164086


√(a^2) =
√(835.5587845)

a = 28.9060337 which rounds to 28.9

User Goldenratio
by
5.7k points
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