Measurement practice

Reading protractors

Read two diagrams with three rays each and answer six named angles per diagram for twelve marks, either on printed faces or with a separate protractor.

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With answer key · Letter With answer key · A4

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Find CAB, DAB, EAB, CAF, DAF and EAF in each of the two diagrams.

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Student worksheet Worksheet with answers

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Student worksheet Worksheet with answers

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Learning objective

What this activity builds

Select the correct zero origin and connect opposite-baseline readings as supplementary angles.

Worked example

If CAB is 60°, what is CAF?

120°

AB and AF are opposite baseline rays, so CAB and CAF sum to 180°. Subtract 60° from 180°.

Teaching notes

Make the practice count

A is the vertex. Read from AB for angles ending in B and from AF for angles ending in F.
Use the matching number ring when the face is shown.
In Use your own protractor mode, align the center and baseline with A, B and F.

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