Chapter 15 — Practice 1
18 original mixed questions
Practice earlier ideas together. Check answers only after you have completed an attempt.
Classify a 150° angle as acute, right, obtuse, or straight.
Show answer and reasoning
Compare 150° to 90° and 180°. A ray length does not affect the turn.
Measure the smaller indicated angle between the two rays, in degrees.
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Align the protractor at the vertex and read from the baseline: 155°.
Using a protractor, construct an angle measuring 155°. Label its vertex and both rays.
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Check placement of the center and zero baseline; mark 155°, draw second ray, and label.
An angle of 78° lies next to another angle on a straight line. Find the missing angle.
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Adjacent angles along a straight line add to 180°. Subtract 78 from 180.
The smaller angle between two rays is 46°. Find their reflex angle.
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Reflex angle = 360°−46°=314°. Mark the outside turn.
Classify a 110° angle as acute, right, obtuse, or straight.
Show answer and reasoning
Compare 110° to 90° and 180°. A ray length does not affect the turn.
Measure the smaller indicated angle between the two rays, in degrees.
Show answer and reasoning
Align the protractor at the vertex and read from the baseline: 20°.
Using a protractor, construct an angle measuring 165°. Label its vertex and both rays.
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Check placement of the center and zero baseline; mark 165°, draw second ray, and label.
An angle of 131° lies next to another angle on a straight line. Find the missing angle.
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Adjacent angles along a straight line add to 180°. Subtract 131 from 180.
The smaller angle between two rays is 142°. Find their reflex angle.
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Reflex angle = 360°−142°=218°. Mark the outside turn.
Classify a 125° angle as acute, right, obtuse, or straight.
Show answer and reasoning
Compare 125° to 90° and 180°. A ray length does not affect the turn.
Measure the smaller indicated angle between the two rays, in degrees.
Show answer and reasoning
Align the protractor at the vertex and read from the baseline: 65°.
Using a protractor, construct an angle measuring 120°. Label its vertex and both rays.
Show answer and reasoning
Check placement of the center and zero baseline; mark 120°, draw second ray, and label.
An angle of 106° lies next to another angle on a straight line. Find the missing angle.
Show answer and reasoning
Adjacent angles along a straight line add to 180°. Subtract 106 from 180.
The smaller angle between two rays is 107°. Find their reflex angle.
Show answer and reasoning
Reflex angle = 360°−107°=253°. Mark the outside turn.
Classify a 40° angle as acute, right, obtuse, or straight.
Show answer and reasoning
Compare 40° to 90° and 180°. A ray length does not affect the turn.
Measure the smaller indicated angle between the two rays, in degrees.
Show answer and reasoning
Align the protractor at the vertex and read from the baseline: 90°.
Using a protractor, construct an angle measuring 30°. Label its vertex and both rays.
Show answer and reasoning
Check placement of the center and zero baseline; mark 30°, draw second ray, and label.