Chapter 15: Chapter review
37 questions · with revealable worked answers
Classify a 180° angle as acute, right, obtuse, or straight.
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Compare 180° 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: 165°.
Using a protractor, construct an angle measuring 85°. Label its vertex and both rays.
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Check placement of the center and zero baseline; mark 85°, draw second ray, and label.
An angle of 27° 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 27 from 180.
The smaller angle between two rays is 72°. Find their reflex angle.
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Reflex angle = 360°−72°=288°. Mark the outside turn.
Classify a 100° angle as acute, right, obtuse, or straight.
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Compare 100° 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: 135°.
Using a protractor, construct an angle measuring 25°. Label its vertex and both rays.
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Check placement of the center and zero baseline; mark 25°, draw second ray, and label.
An angle of 149° 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 149 from 180.
The smaller angle between two rays is 82°. Find their reflex angle.
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Reflex angle = 360°−82°=278°. Mark the outside turn.
Classify a 145° angle as acute, right, obtuse, or straight.
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Compare 145° 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: 75°.
Using a protractor, construct an angle measuring 70°. Label its vertex and both rays.
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Check placement of the center and zero baseline; mark 70°, draw second ray, and label.
An angle of 80° 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 80 from 180.
The smaller angle between two rays is 83°. Find their reflex angle.
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Reflex angle = 360°−83°=277°. Mark the outside turn.
Classify a 135° angle as acute, right, obtuse, or straight.
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Compare 135° 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: 150°.
Using a protractor, construct an angle measuring 35°. Label its vertex and both rays.
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Check placement of the center and zero baseline; mark 35°, draw second ray, and label.
An angle of 102° 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 102 from 180.
The smaller angle between two rays is 164°. Find their reflex angle.
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Reflex angle = 360°−164°=196°. Mark the outside turn.
Classify a 70° angle as acute, right, obtuse, or straight.
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Compare 70° 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: 105°.
Using a protractor, construct an angle measuring 140°. Label its vertex and both rays.
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Check placement of the center and zero baseline; mark 140°, draw second ray, and label.
An angle of 71° 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 71 from 180.
The smaller angle between two rays is 57°. Find their reflex angle.
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Reflex angle = 360°−57°=303°. Mark the outside turn.
Classify a 15° angle as acute, right, obtuse, or straight.
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Compare 15° 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: 110°.
Using a protractor, construct an angle measuring 115°. Label its vertex and both rays.
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Check placement of the center and zero baseline; mark 115°, draw second ray, and label.
An angle of 77° 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 77 from 180.
The smaller angle between two rays is 31°. Find their reflex angle.
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Reflex angle = 360°−31°=329°. Mark the outside turn.
Classify a 155° angle as acute, right, obtuse, or straight.
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Compare 155° 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: 160°.
Classify a 95° angle as acute, right, obtuse, or straight. Explain which turn or benchmark you used.
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Compare 95° to 90° and 180°. A ray length does not affect the turn. The explanation must identify the selected angle region and use 90°, 180°, or 360° as appropriate.
Measure the smaller indicated angle between the two rays, in degrees. Explain which turn or benchmark you used.
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Align the protractor at the vertex and read from the baseline: 70°. The explanation must identify the selected angle region and use 90°, 180°, or 360° as appropriate.
Using a protractor, construct an angle measuring 75°. Label its vertex and both rays. Explain which turn or benchmark you used.
Show answer and reasoning
Check placement of the center and zero baseline; mark 75°, draw second ray, and label. The explanation must identify the selected angle region and use 90°, 180°, or 360° as appropriate.
An angle of 114° lies next to another angle on a straight line. Find the missing angle. Explain which turn or benchmark you used.
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Adjacent angles along a straight line add to 180°. Subtract 114 from 180. The explanation must identify the selected angle region and use 90°, 180°, or 360° as appropriate.
The smaller angle between two rays is 31°. Find their reflex angle. Explain which turn or benchmark you used.
Show answer and reasoning
Reflex angle = 360°−31°=329°. Mark the outside turn. The explanation must identify the selected angle region and use 90°, 180°, or 360° as appropriate.