Angle pairsAngles in a right angle
Name: Date:
Find the angle marked x. Give each answer in degrees.
1 degrees
2 degrees
3 degrees
4 degrees
5 degrees
6 degrees
7 degrees
8 degrees
Complementary angles worksheets
Two complementary angles fit together into a right angle, so they add to 90 degrees. These free printable worksheets draw a pair with one marked x, cut from the mixed angle-pair page.
If they get stuck
Complementary angles
The answer key prints on a separate page.
What's on this sheet
The mixed angle-pair page rotates complementary, supplementary, and vertical relationships so a child has to decide which one the figure shows. This sheet drills just the complementary case, so the fact — the two make ninety — becomes automatic before the choosing begins.
Why this sheet works
Each figure shows two angles meeting at a square corner, with the corner mark that says they complete a right angle. The arithmetic is one subtraction from 90; the work is reading that the picture is a right angle in the first place, and writing the equation x + 65 = 90 before solving it.
How this one works
One question from a sheet like this one, worked a step at a time — with a sentence saying what just happened and why.
Complementary angles, step by step