How to measure angles using a protractor :
It is useful to work with pairs of angles and to understand how pairs of angles relate to each other. Congruent angles are angles that have the same measure.
Step 1 :
Using a ruler, draw a pair of intersecting lines.
Label each angle from 1 to 4.
Step 2 :
Use a protractor to help you complete the chart.
m<1 + m<2
m<2 + m<3
m<3 + m<4
m<4 + m<1
Measure of Angle
Measure the angle given below.
Important Note :
In the figure given above, the vertex of the angle is found on the left side.
Whenever we measure angle where its vertex is found on the left side, we have to consider the angles on the bottom row of the protractor. .
In case, the vertex of the angle is found on the right side, we have have to consider the angles on the top row of the protractor.
Step 1 :
Place the midpoint of the protractor on the vertex (at P) of the angle.
Step 2 :
Line up one side of the angle (PA) with the zero line of the protractor (where you see the number 0).
Step 3 :
In the above figure, since the vertex of the angle is found on the left side, we have to consider the angles on the bottom row of the protractor
Step 4 :
Read the degrees on the bottom line of the protractor where the other side (PQ) crosses.
In the above figure, one side of the angle (PA) with the zero line of the protractor (where you see the number 0).
The other side of the angle (PQ) crosses at 60° on the bottom row of the protractor.
Hence, measure of the given angle is 60°
After having gone through the stuff given above, we hope that the students would have understood "Measuring angles".
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