How to draw angles
Drawing angles uses a very similar method to measuring angles. If you know how to measure angles, you will pick up drawing them in no time!
You need a:
- protractor
- sharp pencil
- ruler
Example 1
Draw an angle of 50掳.
Step 1: Draw a straight line using a ruler.
Step 2: Place the centre (cross section) of the protractor at one end of the line. This will become the vertex (corner) of the angle. Make sure the line lines up with the base line of the protractor.
Step 3: Look for 50掳 on the protractor.
There are two lots of numbers on the protractor - on the inside and outside. Look for the zero that is on the same side as the line. It is on the left-hand side and on the outside.
Make a mark where the 50掳 is on the outside scale.
Step 4: Remove the protractor. Using a ruler, join the mark you made to the end of the line that was in the centre of the protractor.
Example 2
Draw an angle of 120掳.
Step 1: Draw a straight line using a ruler.
Step 2: Place the centre (cross section) of the protractor at one end of the line. This will become the vertex (corner) of the angle. Make sure the line lines up with the base line of the protractor.
Step 3: Look for 120掳 on the protractor. Since the zero is on the inside scale, look for the 120掳 that is also on the inside. Create a small mark at this point.
Step 4: Remove the protractor. Using a ruler, join the mark you made to the end of the line that was in the centre of the protractor.
Top tip
Always double check your angle with a protractor once you have drawn in.
This is to make sure that the protractor didn鈥檛 move at any point and cause an inaccurate answer.
Activities
Quiz
Activity 2
Drawing angles activity
You will need a piece of paper, pencil and a protractor.
Using a protractor, draw the following angles:
130掳
20掳
105掳
an acute angle
an obtuse angle
a right angle
EXT: Draw five more angles of your choice
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