Practice identifying complementary and supplementary angles and finding missing angle measures.
Read each problem carefully. Use the facts that complementary angles add to 90 degrees and supplementary angles add to 180 degrees. Show your work in the space provided.
Find missing angle measures using angle relationships
Geometry - Grade 6-8
- 1
Angle A measures 35 degrees. Angle B is complementary to Angle A. What is the measure of Angle B?
- 2
Angle C measures 112 degrees. Angle D is supplementary to Angle C. What is the measure of Angle D?
- 3
Two angles are complementary. One angle measures 27 degrees. Find the measure of the other angle.
- 4
Two angles form a straight line. One angle measures 46 degrees. What is the measure of the other angle?
- 5
Classify the pair of angles as complementary, supplementary, or neither: 40 degrees and 50 degrees.
- 6
Classify the pair of angles as complementary, supplementary, or neither: 73 degrees and 107 degrees.
- 7
Classify the pair of angles as complementary, supplementary, or neither: 25 degrees and 55 degrees.
- 8
In the diagram, two adjacent angles form a right angle. One angle is 38 degrees and the other angle is x degrees. Write and solve an equation to find x.
- 9
In the diagram, two adjacent angles form a straight angle. One angle is 125 degrees and the other angle is y degrees. Write and solve an equation to find y.
- 10
The measure of an angle is x degrees. Its complement is 18 degrees. Write and solve an equation to find x.
- 11
The measure of an angle is n degrees. Its supplement is 141 degrees. Write and solve an equation to find n.
- 12
A vertical ray stands on a horizontal line, making a 90 degree angle on each side of the ray. One of the 90 degree angles is split into two angles labeled 64 degrees and z degrees. Find z.