In ∆ABC, ∠A is a right angle and m∠B = 45°. Find BC. Question In ∆ABC, ∠A is a right angle and m∠B = 45°. Find BC. in progress 0 Math Delilah 1 week 2021-09-11T02:40:41+00:00 2021-09-11T02:40:41+00:00 1 Answer 0

## Answers ( )

Step-by-step explanation:In ∆ABC, if <A is 90° and <B is 45° then hypotenuse is BC.

Now,

Cos B= base/height

Cos B= AB/ BC

BC= AB/cos 45°.