Measuring and Drawing Angles

The video tutorial explains how to use a protractor to draw and measure angles. It begins with an introduction to the protractor, followed by detailed steps to draw a 60-degree and an 85-degree angle. The tutorial then covers how to measure angles, including reflex angles, using a protractor. The importance of aligning the protractor correctly and identifying the correct degree markings is emphasized throughout.

What is the primary function of a protractor?

• To calculate area

• To draw straight lines

• To measure and draw angles

• To measure length

When drawing a 60-degree angle, where should the center of the protractor be placed?

• At the start of the ray

• At the vertex of the angle

• At the midpoint of the ray

• At the endpoint of the ray

How do you determine which 60-degree mark to use on a protractor?

• Use the one closest to the edge

• Use the one corresponding to the zero line used

• Use the one at the top

• Use the one at the bottom

What mistake was made when initially drawing angle PQR?

• The wrong zero line was used

• The protractor was not centered

• The angle was drawn at the wrong vertex

• The wrong degree mark was used

How can you find the midpoint between two degree marks on a protractor?

• By estimating visually

• By counting the divisions between them

• By using a calculator

• By using a ruler

What should you ensure when measuring an angle with a protractor?

• The protractor's center is at the angle's vertex

• The protractor is placed on a flat surface

• The protractor is aligned with the paper edge

• The protractor is held vertically

If an angle measures 135 degrees, what type of angle is it?

• Reflex

• Obtuse

• Right

• Acute

What is the sum of angles in a full rotation?

• 180 degrees

• 270 degrees

• 450 degrees

• 360 degrees

How do you measure a reflex angle using a protractor?

• By estimating visually

• By using a compass

• By measuring directly with the protractor

• By measuring the smaller angle and subtracting from 360

What is the measure of a reflex angle if the smaller angle is 140 degrees?

• 140 degrees

• 220 degrees

• 180 degrees

• 320 degrees