# Drawing Angles

In these lessons, we will look at how to use a protractor to

• draw an angle less than 180˚
• draw an angle greater than 180˚ (reflex angle)

### Drawing Angles Using a Protractor: How to draw an angle less than 180˚

Example:
Draw an angle ABC, which is 55˚.

Step 1: Draw a line BC and mark B as the vertex.

Step 2: Place the centre of the protractor at the vertex B and adjust the base line to be aligned to BC.

Step 3: Find 55˚ on the outer scale of the protractor and mark that point as point A.

Step 4: Remove the protractor and draw a line from point B to point A

Step 5: Label and ABC

How to draw and measure angles using a protractor?

Examples:
Draw and measure
a) a 110° angle.
b) a 27° angle

Measuring angles using a protractor (acute angles)

Measuring Angles with Protractors (obtuse angles)

### How to draw an angle greater than 180˚ (Reflex angle)

To draw a reflex angle (i.e. angle greater than 180º and less than 360º), we need to

• Subtract the reflex angle from 360º.
• Draw the resulting angle as described above.
• Mark the required angle which is outside the one that has been drawn.

Example:
Draw an angle ABC = 250˚

To draw the reflex angle, 250˚, we first draw the angle obtained by subtracting 250˚ from 360˚ which is 360˚ – 250˚ = 110˚

Step 1: Draw the line BC

Step 2: Place the centre of the protractor at the vertex B and adjust the base line to be aligned to BC.

Step 3: Find the angle 110˚ on the protractor (inner) scale and mark that as point A.

Step 4: Remove the protractor and draw a line from point B to point A.

Step 5: Label the reflex angle ABC

How to use a protractor to draw acute angles, right angles, obtuse angles and reflex angles?

How to draw a Reflex Angle?

How to Measure a Reflex Angle Using a Protractor?

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