## Trigonometry 7th Edition

Published by Cengage Learning

# Chapter 1 - Section 1.1 - Angles, Degrees, and Special Triangles - 1.1 Problem Set: 21

#### Answer

A = $50^{\circ}$

#### Work Step by Step

in triangle ABC- Given data is- B = $30^{\circ}$ C = α + β = $100^{\circ}$ As we know that all the three angles of a triangle add up to 180 degrees, therefore- A + B + C = $180^{\circ}$ A = $180^{\circ}$ - $(B+C)^{\circ}$ A = $180^{\circ}$ - $(30+100)^{\circ}$ A = $180^{\circ}$ - $130^{\circ}$ A = $50^{\circ}$

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.