- Another way to say angles are complementary is if two angles next to one another are Right Angles.
- Complementary angles have length but no width or height.
- If we look at the diagram below, the two adjacent angles
are
**∠DBE**and**∠EBC**. The sum of these two angles are 90° because they form a right angle. - Let us assume that angle
**∠DBE**is 65°. That means that 65° plus**∠EBC**equals 90°. Taken to the next step, 90° - 65° =**∠EBC**= 25°.