Measuring Angles with a Protractor

The video tutorial by Math Fanatic explains how to measure angles using a protractor. It covers the types of angles—acute, right, and obtuse—and provides tips on estimating angles using index cards. The tutorial demonstrates how to align the protractor with the angle's vertex and base side, and how to read the measurement. It also explains the use of a two-way protractor and offers practical tips for measuring angles on paper.

What tool is primarily used to measure angles?

• Protractor

• Caliper

• Compass

• Ruler

Tags

CCSS.4.MD.C.6

Which angle type is exactly 90 degrees?

• Obtuse

• Right

• Straight

• Acute

Tags

CCSS.4.G.A.1

What is used to check if an angle is exactly 90 degrees?

• Tape measure

• Compass

• Index card

• Protractor

Tags

CCSS.4.MD.C.6

Which of the following is not a type of angle mentioned?

• Acute

• Right

• Obtuse

• Circular

Tags

CCSS.4.G.A.1

What should you do if the angle measurement is ambiguous near 90 degrees?

• Use an index card to verify

• Start over the measurement

• Measure from a different side

• Guess the angle

Tags

CCSS.4.MD.C.6

When measuring an angle, where should the vertex be aligned on the protractor?

• Outside the protractor

• At the center needle

• At the 90 degree mark

• At any number

Tags

CCSS.4.MD.C.6

How can you determine if an angle is acute when using a protractor?

• It measures more than 90 degrees

• It measures less than 90 degrees

• It is exactly 90 degrees

• It aligns with the 180 degree mark

Tags

CCSS.4.MD.C.6

What is the correct way to align the protractor when the base side points to the right?

• No specific alignment needed

• Align with the left 0 to 180 mark

• Align with the right 0 to 180 mark

• Align with the top of the protractor

Tags

CCSS.4.MD.C.6

What should you do if the base side of an angle points to the left?

• Measure from 180 to 0

• Ignore the base side

• Use the left scale of the protractor

• Use the right scale of the protractor

Tags

CCSS.4.MD.C.6

What is the purpose of rotating the paper when measuring angles?

• To make it easier to read

• None of the above

• To align the angle with the protractor's base side

• To confuse the measurement

Tags

CCSS.4.MD.C.6