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7. Some students placed their protractors to measure the angles as shown below.

∠U = 45°
∠V = 90°

U

Reyan Parag V

∠X = 150°
∠W = 60°

Mayuri Krishna

In each figure, identify the incorrect usage(s) of the protractor and discuss how the
readings can be corrected.

Making Your own Protractor

1. Draw a circle on a sheet of paper and cut out the circle.
2. Fold the circle to get two halves of it. Write ʻ0°’ in the bottom right corner of the semicircle.

1
3. Measure of half a circle = of a full turn = 180°.
2
4. Write 180° in the bottom left corner of the semicircle.

180° 0°

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