Question

Find the length of side AB.
Give your answer to 1 decimal place.

Answer 1

AB = 5.6 cm

Explanation:

Reference angle = 62°

Adjacent = AB

Hypotenuse = 12 cm

Applying trigonometric ratio,

Cos 62 = adj/hyp

Cos 62 = AB/12

12*Cos 62 = AB

AB = 5.6 cm (1 d.p)