Page 3 - CH - 2 - LN- 2.3

 Reading the Protractor: Starting from the rightmost point, there are long marks for every 10
degrees and medium-sized marks for every 5 degrees. This makes it easier to count and
measure angles.

There are two types:
 Unlabelled Protractor: A protractor without numbers, showing only marks. You count the
degree units from the markings to measure an angle. This requires you to carefully count
each small mark to determine the angle.

 Labelled Protractor: A protractor with numbers marked, making it easier to measure angles.
The numbers typically range from 0° to 180° in both directions (clockwise and
counterclockwise).

Using a labelled protractor simplifies the process of measuring angles, as you can directly see the
angle's degree measure.

Measuring Angles with a Protractor
1. Place the Protractor: Align the protractor so that its center is on the vertex of the angle.

2. Align One Arm: Ensure that one arm of the angle passes through the 0° mark on the
protractor.

3. Read the Measure: The number on the protractor where the other arm passes through
indicates the angle’s measure in degrees.