The lengths of the sides of a triangle are 15m, 21m, and ...
The lengths of the sides of a triangle are 15m, 21m, and 28cm. What is the size of the angle facing the side 21m (correct to one decimal place)?
85.7°
47.5°
41.4°
38.2°
Correct answer is B
using cosine rule,
cosθ = 282+152−2122×28×15
= 568840
θ=cos−1
= 47.5°
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