Solving for Missing Angles
9th Grade · Math · 45 min
Lesson Preview
Learning Objective
I can solve for a missing angle or variable in complementary angle problems.
- 1
Complementary angles are two or more angles that add up to 90 degrees.
- 2
If one angle is 27° and the two angles are complementary, the other angle can be found by solving the equation 27 + B = 90, so B = 63°.
- 3
When solving for x in a complementary angle problem, set up an equation where the sum of the angles equals 90 degrees, then combine like terms and isolate x.
