Complementary and supplementary angles
The question
degrees
Angles in a right angle, one is 27°
How it works.
27°+x=90°
90 − 27 =63°
27°+63°=90°
from the picture, not the numbers
lines crossing:x = the angle opposite
- 01
The two angles fill a right angle — the little square in the corner means 90°.
- 02
So the two must add to 90: x = 90 − 27 = 63°.
- 03
Check it: 27 + 63 = 90.
- 04
Good to know too: where two lines cross, the angles facing each other are equal.