Measuring & Comparing Angles

Measuring & Comparing Angles
Angles are measured using a protractor.

Angles are measured using a protractor. They are also measured in degrees. Use the degree symbol… for example, 20°

Vertex Bottom Ray When measuring using a protractor, you must get the vertex and the bottom ray of the angle centered on the zero line of the protractor.

Then read the angle measure by finding where the ray that opens up from the bottom ray lies.

60° Then read the angle measure by finding where the ray that opens up from the bottom ray lies. In this case, the angle is 60°.

You use the inside scale because the angle is opening up from the right side and the values are increasing as the ray opens up.

Try one…what is the measure of this angle ? Vertex Bottom Ray

Try one…what is the measure of this angle ? Answer : 100°

Try another…what is the measure of this angle ?

Try another…what is the measure of this angle ? Answer : 35° ( use the outside scale since the angle opens up from the left )

Last one…what is the measure of this angle ?

Last one…what is the measure of this angle ? Answer : °58 ( extend the rays if you need to … )

Let’s sketch a few angles…

Let’s sketch a few angles… Draw a 45° angle that opens up from the right.

Let’s sketch a few angles… Draw a 45° angle that opens up from the right. 1. Make a point and center your protractor on it

Let’s sketch a few angles… Draw a 45° angle that opens up from the right. Make a point and center your protractor on it Now use the edge of your protractor and extend the bottom line

Let’s sketch a few angles… Draw a 45° angle that opens up from the right. Make a point and center your protractor on it Now use the edge of your protractor and extend the bottom line Find your angle value on the inside scale ( opens from right ) and place a little hash mark on the outside of the protractor

Let’s sketch a few angles… Draw a 45° angle that opens up from the right. Make a point and center your protractor on it Now use the edge of your protractor and extend the bottom line Find your angle value on the inside scale ( opens from right ) and place a little hash mark on the outside of the protractor Now rotate the bottom edge of the protractor to that hash mark from the vertex and connect the two with a line

Let’s sketch a few angles… Draw a 100° angle that opens up from the left.

Let’s sketch a few angles… Draw a 100° angle that opens up from the left. Make a point and center your protractor on it

Let’s sketch a few angles… Draw a 100° angle that opens up from the left. Make a point and center your protractor on it Now use the edge of your protractor and extend the bottom line

Let’s sketch a few angles… Draw a 100° angle that opens up from the left. Make a point and center your protractor on it Now use the edge of your protractor and extend the bottom line Find your angle value on the outside scale ( opens from left ) and place a little hash mark on the outside of the protractor

Make a point and center your protractor on it Now use the edge of your protractor and extend the bottom line Find your angle value on the outside scale ( opens from left ) and place a little hash mark on the outside of the protractor Now rotate the bottom edge of the protractor to that hash mark from the vertex and connect the two with a line

Measuring & Comparing Angles

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Measuring & Comparing Angles

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