Understanding Protractor Usage and Angle Measurement

This video tutorial explains how to read a protractor to measure angles accurately. It begins with estimating whether an angle is acute, right, or obtuse. The tutorial then details the steps to use a protractor, including aligning the vertex and choosing the correct scale. It also covers special cases, such as when the angle falls between labeled numbers or when using an online protractor.

What is the primary function of a protractor?

• To draw straight lines

• To find the perimeter

• To measure angles

• To calculate area

Which type of angle is less than 90 degrees?

• Right angle

• Obtuse angle

• Acute angle

• Straight angle

What should you align with the hole on the protractor?

• The angle's arc

• The angle's bisector

• The angle's ray

• The angle's vertex

How should the numbers on a protractor be oriented?

• Sideways

• Correctly facing you

• Upside down

• Backwards

If an angle is obtuse, which set of numbers should you use?

• The numbers closest to zero

• The larger numbers

• The smaller numbers

• The numbers closest to 180

What should you do if an angle falls between two labeled numbers?

• Estimate the number of marks past the lower number

• Ignore the measurement

• Round down to the nearest number

• Round up to the nearest number

What feature of a protractor can help extend short rays?

• The protractor's edge

• The compass

• The ruler

• The angle guide

Where should you place the vertex if the protractor has no hole?

• At the edge of the protractor

• At the center of the protractor

• At the intersection of the lines

• At the top of the protractor

How do you rotate an online protractor?

• By using the keyboard

• By tilting the screen

• By clicking and holding arrows

• By dragging it with the mouse