Find all missing sides and angles for triangle ABC, where a, b, and c are length of the sides opposite angles A,B and C respectively.

Question

A=4ft, b=8ft, c=10ft

round to nearest tenth

Answer 1

4² = 8² + 10² - (2)(8)(10) cos A

8² = 4² + 10² - (2)(4)(10) cos B

C = 180° - A - B