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Question

Which of the following angles can be constructed without using a protractor?

A
50
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B
60
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C
70
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D
80
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Solution

The correct option is B 60
Only 60o can be constructed using a scale and compass.
1. Draw a line l.
2. With O as centre and with any convenient radius, draw an arc to cut line l at A.
3. With A as centre and with the same radius, draw an arc to cut the previous arc at B.
4. Join OB and extend. AOB= 60o
The remaining three angles cannot be constructed without using a protractor.

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