Measuring Angles Angles are formed between two rays that intersect at a point. We can measure the angle by using a protractor and a compass. - A protractor...
Measuring Angles
Angles are formed between two rays that intersect at a point. We can measure the angle by using a protractor and a compass.
A protractor is a device with two scales that can be used to measure angles. One scale is called the "vertex scale," and the other scale is called the "ray scale."
The vertex scale is graduated in degrees, and the ray scale is graduated in minutes.
To measure an angle, place the vertex scale on the vertex of the angle and the ray scale on the corresponding side. Make sure that the scales are parallel.
Use the vertex scale to measure the degree measure of the angle, and use the ray scale to measure the minute measure of the angle.
Examples:
An angle that measures 45 degrees is formed between two rays that intersect at a point 45 degrees from the vertex.
An angle that measures 120 degrees is formed between two rays that intersect at a point 120 degrees from the vertex.
An angle that measures 30 degrees is formed between two rays that intersect at a point 30 degrees from the vertex