Complementary Angles

How to solve the angles that are complementary: formula, 1 example, and its solution.

Formula

Formula

Complementary angles are two angles (∠1 and ∠2)
whose sum of the measures are 90:
m∠1 + m∠2 = 90.

Unlike a linear pair,
complementary angles
don't have to be adjacent to each other.

Supplementary Angles

Example

Example

Solution

It says
the given two angles are complementary.

So [30] + [8x + 4] = 90.

30 + 4 = +34

Move +34 to the right side.

Then 8x = 56.

Divide both sides by 8.

Then x = 7.

So x = 7 is the answer.