Question

A triangle has sides 11 cm, 16 cm and 7 cm. the largest angles has size of x. calculate X. Round your answer to the nearest degree.

Answer 1

124°

Explanation:

cos X = (11²+7²-16²)/2(11)(7)

= (121+49-256)/154

= -86/154

= -0.5584

X = cos~¹ -0.5584 = 124°