Question

A, B & C form the vertices of a triangle.

∠
CAB = 90°,
∠
ABC = 73° and AB = 8.6.
Calculate the length of BC rounded to 3 SF

Answer 1

using the trigonometry identities

Cos ∅ = Adj/Hyp

where ∅ = 73°

Cos 73 = 8.6/x

X × Cos 73 = 8.6

x = 8.6/0.2923

x = 29.421 ≈ 29.4