Question

Helpppp please Metall!!


2. In triangle ABC, A is a right angle, and mB = 45°

what is the length of BC if your answer is not integer, leave it in simplest radical form

Answer 1

@izuru @phi

Answer 2

This is an isoceles triangle. Isoceles right triangles have a special feature. The sum of all interior angles of a triangle is 180 degrees. You already have two angles known. 90 degrees and 45 degrees. Add them up, and subtract it from 180. That's the measurement of the other angle. Now, find BC by using cosine.