Question

7.2.1 determine the length of :
BD
CD

Answer 1

BD = 164.92 m

CD = 177.34 m

Explanation:

sine rules:

AB : sin ∠D = BD : sin ∠A

90.52 : sin 31.23° = BD : sin 109.16°

BD = 164.92 m

cosine rules:

CD² = BD² + BC² - 2(BD)(BC) cos ∠B

= 164.92² + 235² - 2(164.92)(235) cos 48.88

= 31448.49

CD = 177.34 m