Exploring Protractors: The Tool for Measuring Angles

The video tutorial explains various measurement tools for length, volume, and weight, and introduces protractors as the tool for measuring angles. It covers the properties of circles and angles, the historical context of dividing a circle into 360 degrees, and the consistent markings on measurement tools. The tutorial details the features of protractors, including their ability to measure angles from 0 to 360 degrees, and explains how to use them effectively. The lesson concludes with a recap of the key points about measuring angles with protractors.

Which tool is commonly used to measure the length of an object?

• Beaker

• Ruler

• Protractor

• Scale

What is the historical reason for dividing a circle into 360 degrees?

• It was based on the number of hours in a day.

• It was based on the number of days in a year.

• It was based on the number of months in a year.

• It was based on the number of weeks in a year.

What is the primary function of a protractor?

• To measure the weight of an object

• To measure the volume of a liquid

• To measure the length of an object

• To measure the opening of an angle

How many degrees can a full protractor measure?

• 90 degrees

• 180 degrees

• 270 degrees

• 360 degrees

What is unique about some protractors that measure up to 180 degrees?

• They have no markings.

• They can measure angles opening to both the right and left.

• They have a starting point of 90 degrees.

• They are used to measure liquid volume.