Draw angles accurately using a protractor

Maths

In this unit pupils will compare the size of angles where there is a clear visual difference and use the terms acute, obtuse and reflex when describing the size of angles or amount of rotation with relation to right angles using a unit called degrees. In the future unit pupils will use knowledge of shape properties to draw, sketch and identify shapes.

In the prior unit pupils completed and composed symmetrical shapes from two congruent shapes and investigate lines of symmetry in 2D shapes. In this unit pupils will compare the size of angles where there is a clear visual difference and use the terms acute, obtuse and reflex when describing the size of angles or amount of rotation with relation to right angles using a unit called degrees.

Angles: compare, name, estimate and measure angles

Line up your protractor with one end of the line.

Mark a point on the edge of the protractor where the angle is.

Use a ruler to join the end of the line with the point.

Check the angle to see if it looks accurate.

Ensure the lines you draw are always longer than the length of the protractor.

Only use a protractor to draw acute and obtuse angles.

Tick the correct statements. To draw an angle, you should:

The zero line of a 45° angle has been drawn. Which line and arc would be most appropriate to use to create the angle?

The zero line of a 25° angle has been drawn. Which line and arc would be most appropriate to use to create the angle?

The zero line of a 130° has been drawn. Which line and arc would be most appropriate to use to create the angle?

Jun says that he has drawn four polygons which all have a 30° angle marked.
Tick the shapes that are correct.

The tool used to measure the size of an angle is known as:

The name of the line we draw to mark an angle is known as __________.

Which image shows the protractor placed correctly to measure the angle?

Read the protractor scale to measure the angle. {{ }}°

This lesson will soon be taken down.

Draw angles accurately using a protractor

Lesson outcome