Measuring Angles with a Protractor

This video tutorial by Mr. Ace Math covers the process of measuring angles using a protractor. It begins with a review of basic concepts such as lines, line segments, rays, and angles. The tutorial explains what a protractor is and how it is used to measure angles in degrees. It provides a step-by-step guide on placing the vertex and start ray correctly on the protractor. The video includes several examples and practice problems to reinforce the learning. The lesson concludes with a summary of the key points covered.

What forms an angle?

• Two lines intersecting at any point

• Two rays sharing the same endpoint

• A line and a ray intersecting

• Two parallel lines

What is the vertex of an angle?

• The midpoint of the hypotenuse

• The highest point of the angle

• The common endpoint of two rays

• The point where two lines meet

What is the main use of a protractor?

• Measuring angles in degrees

• Measuring the length of lines

• Cutting paper in straight lines

• Drawing perfect circles

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CCSS.4.MD.C.6

How many degrees are there in a full rotation?

• 180 degrees

• 90 degrees

• 270 degrees

• 360 degrees

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CCSS.4.MD.C.5B

CCSS.HSG.CO.A.1

Where should the vertex of an angle be placed on a protractor?

• At the 90-degree mark

• In the middle of the protractor

• Anywhere on the protractor

• At one of the zeros

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CCSS.4.MD.C.6

If your start ray goes through the zero on the right side of a protractor, which numbers do you use?

• None of the numbers

• Both sets of numbers

• The outside numbers

• The inside numbers

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CCSS.4.MD.C.6

What is the measure of an angle that extends slightly past 170 degrees?

• 170 degrees

• 180 degrees

• 171 degrees

• 175 degrees

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CCSS.4.MD.C.6

What is the measure of an angle that doesn't reach 10 degrees?

• 10 degrees

• 9 degrees

• 0 degrees

• 5 degrees

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CCSS.4.MD.C.6

How do you measure an angle with a start ray through the left zero?

• Use a ruler instead

• Estimate visually

• Use the outside numbers

• Use the inside numbers

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CCSS.4.MD.C.6

What is the correct way to extend an angle for measurement?

• Draw a line perpendicular to one ray

• You cannot extend angles

• Draw a line parallel to one ray

• Extend the angle's rays to reach the protractor

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CCSS.4.MD.C.6