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Protractor usage
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Slide 1

Measuring, calculating and drawing angles .

Measuring, calculating and drawing angles .

Our learning objectives today

To use a protractor to:

measure acute and obtuse angles to the nearest degree.

draw acute and obtuse angles to the nearest degree.

To calculate angles on a straight line.

Slide 2

What do we use to help us?

What do we use to help us?

A protractor

Here is a standard protractor like you

use in the classroom.

Slide 3

When we use a protractor, we need to line it up correctly.

When we use a protractor, we need to line it up correctly.

You need to make sure the protractor is lined up correctly.

Is this ready to measure the angle?

Slide 4

Were you right it wasnt

Were you right it wasnt

Look for the upside down T in the middle of the straight line on your protractor.

This needs to be exactly on the vertex of your angle.

Slide 5

We need to remember .

We need to remember .

It doesnt

matter which

way round the

angle is, you

ALWAYS need

to line the upside

down T to the vertex

of the angle.

Slide 6

Now you are ready.

Now you are ready.

Read from the 0, and follow the inner set of numbers.

Slide 7

Once you reach 30 you need to be careful!!!

Once you reach 30 you need to be careful!!!

You then need to look at the 1 markings on the outer set of numbers.

Slide 8

What does it measure?

What does it measure?

This angle measures 35.

Slide 9

Measuring, calculating and drawing angles .

Measuring, calculating and drawing angles .

Remember our learning objectives today are

To use a protractor to:

measure acute and obtuse angles to the nearest degree.

draw acute and obtuse angles to the nearest degree.

To calculate angles on a straight line.

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