A, B & C form the vertices of a triangle.
∠
CAB = 90°, ∠
ABC = 74° and AB = 8.9.
Calculate the length of BC rounded to 3 SF.
In triangle BAC
∠A=90o∠B=74o\angle A=90^o\\ \angle B=74^o\\∠A=90o∠B=74o
And AB= 8.9
So
Cos(74o)=ABBCCos(74^o)=\frac{AB}{BC}Cos(74o)=BCAB
0.27=8.9BC0.27=\frac{8.9}{BC}0.27=BC8.9
BC=32.9
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