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Angles

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Angles Answer Key

1. 
What is smaller than a right angle?
  1. acute angle
  2. obtuse angle
  3. right angle
2. 
Two angles whose measures sum to 180°?
  1. Obtuse Angle
  2. Right Angle
  3. Exterior Angle
  4. Supplementary
  5. Interior Angle
  6. Complementary
3. 
Which angle is 60 degrees?
  1. right
  2. acute
  3. obtuse
  4. straight
4. 
A right triangle has an angle measuring 38 degrees. Which is the degree measure of another angle of this triangle?
  1. 52 degrees
  2. 82 degrees
  3. 104 degrees
  4. 142 degrees
5. 
What type of angle is this?
165° Angle #1
  1. acute
  2. obtuse
  3. right
6. 
What is the measurement of this angle in degrees?
Protractor 0° to 30°
  1. 150
  2. 30
  3. 180
  4. 25
7. 
What is the measurement of this angle in degrees?
Protractor 0° to 115°
  • 115 degrees
8. 
You have a 35 degree angle. Determine the complementary angle AND the supplementary angle.
35° Angle #2
  • Complement total is 90, therefore: 90 - 35 = 55, so 55 degrees.
    Supplement total is 180, therefore: 180 - 35 = 145, so 145 degrees.

    Or, 35 + 55 = 90, and 35 + 145 = 180.
9. 
Classify the following angle and justify your answer.
40° Angle #1
  • This is an acute angle because it is less than 90 degrees.
10. 
You have a 65 degree angle. Determine the complementary angle AND the supplementary angle.
65° Angle #2
  • Complementary angle is 25 degrees.
    Supplementary angle is 115 degrees.
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