Measuring Angles with a Circular Protractor

The video tutorial explains how to measure angles using a protractor. It begins by introducing the concept of angle measurement in degrees and describes the use of a protractor, highlighting the difference between semicircle and full circle protractors. The tutorial then provides a step-by-step guide on how to measure angles, emphasizing the importance of aligning one ray with zero and measuring the opening to the other ray. The example used measures an angle of 160 degrees.

What is the maximum angle measurement possible with a semi-circle protractor?

• 90 degrees

• 180 degrees

• 360 degrees

• 270 degrees

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CCSS.4.MD.C.5B

CCSS.HSG.CO.A.1

Why is a full circle protractor considered superior to a semi-circle protractor?

• Measures up to 100 degrees

• Measures up to 270 degrees

• Measures up to 360 degrees

• Measures up to 180 degrees

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CCSS.4.MD.C.6

Which type of protractor allows measurement of angles larger than 180 degrees?

• Semi-circle

• Quarter-circle

• Full circle

• Three-quarter circle

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CCSS.4.MD.C.6

What is the first step in using a protractor to measure an angle?

• Measure the angle directly

• Ensure one ray aligns with zero

• Align the protractor's center with the vertex

• Adjust the protractor to fit the angle

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CCSS.4.MD.C.6

If an angle opens up to the mark labeled 50 on a protractor, what is its measurement?

• 150 degrees

• 200 degrees

• 100 degrees

• 50 degrees

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CCSS.4.MD.C.6

How does one confirm the initial alignment of a protractor for accurate measurement?

• Align at 10 degrees

• Align at 100 degrees

• Align at 50 degrees

• Align at 0 degrees

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CCSS.4.MD.C.6

What would be the angle measurement if the other ray aligns at 160 on the protractor?

• 0 degrees

• 360 degrees

• 180 degrees

• 160 degrees

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CCSS.4.MD.C.6

What is the angle measurement if the opening is only up to the 10-degree mark?

• 40 degrees

• 30 degrees

• 20 degrees

• 10 degrees

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CCSS.4.MD.C.6

What is the correct way to measure an angle using any protractor?

• Align both rays at zero

• Use a ruler instead

• Measure from zero to the second ray

• Guess the angle size

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CCSS.4.MD.C.6

If an angle measures up to 160 degrees, what does this indicate about the angle?

• It is an acute angle

• It is an obtuse angle

• It is a reflex angle

• It is a right angle

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CCSS.4.G.A.1