In right triangle ABC, ∠C is a right angle, m∠B=70∘, and AB=13.

sin70∘≈0.94
cos70∘≈0.34
tan70∘≈2.75
What is the measurement of BC?

1 answer

AB, the hypotenuse, is 13
angle B is 70
cos 70 = BC/13
so
BC = 13 cos 70