Question

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

Answer 1

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