The triangle below has sides with lengths

Question

The triangle below has sides with lengths a = 42 , b = 68 , and c = 89 .

Find the measure of the smallest angle.

Round to the nearest thousandth.

The smallest angle is approximately  ____ °.

Answer 1

Cos rule:

42²=68²+89²-2 x 68 x 89 x cos θ

θ=27.04°