Math 7B Unit 3 Study Guide

15. In a diagram, <X and LY are vertical angles and <X is a complementary angle with LZ. If mLY is 41°, write an equation that you can use for mLZ.

1 answer

Since <X and LY are vertical angles, they are congruent. Therefore, m<X = mLY = 41°.

Since <X is a complementary angle with LZ, we know that m<X + mLZ = 90°.

Substituting the known value of m<X, we get:
41° + mLZ = 90°

This is the equation that can be used to find mLZ.