Measuring Angles in Grade 4 Mathematics

The video tutorial introduces the concept of measuring angles using a protractor. It explains the function of a protractor, which measures angles in degrees, and provides a detailed five-step process for measuring angles accurately. The tutorial includes practical examples of measuring angles and concludes with a preview of constructing angles in the next session.

What instrument is primarily used to measure angles?

• Compass

• Ruler

• Caliper

• Protractor

Angles are measured in which unit?

• Centimeters

• Degrees

• Radians

• Meters

What is the range of degrees marked on a protractor?

• 0 to 90 degrees

• 0 to 180 degrees

• 0 to 360 degrees

• 0 to 270 degrees

Where should the central point of the protractor be placed when measuring an angle?

• On the vertex of the angle

• Anywhere on the paper

• On the midpoint of the line

• Outside the angle

Which line on the protractor should coincide with one arm of the angle?

• 45 degree line

• 180 degree line

• 0 degree line

• 90 degree line

How do you determine the measure of an angle using a protractor?

• Measure the length of the arms

• Guess based on angle size

• Use the markings on the protractor

• Estimate visually

What was the measured angle of P U R?

• 90 degrees

• 180 degrees

• 75 degrees

• 45 degrees

What was the measured angle of P I V?

• 90 degrees

• 75 degrees

• 180 degrees

• 45 degrees

What was the measured angle of L M N?

• 145 degrees

• 45 degrees

• 180 degrees

• 90 degrees

What will be covered in the next session after measuring angles?

• Measuring distances

• Constructing angles

• Drawing circles

• Calculating area