The instrument to measure an angle is a

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Ruler

Protractor

Divider

Compasses

answer is B.

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Detailed Solution

Concept- Hence, in the given question we need to find the instrument which helps to measure the angles. We will see one by one the function of all instruments and we will finalise which is correct .
Now we will see all the options one by one and then we will find which option is suiting the most
1) Ruler this is something which we use to measure the length in centimetre and to make one line without angles hence, this does not help in measuring the angles.
2) Protector is a type of instrument which divides itself in 180° and it will help to measure the angles. Hence, this is the correct option .
3) Dividing this instrument helps in dividing the area in specific parts . hence it cannot be used in measuring the angles.
4) Compass is generally used to make circles and the intersecting area so it is not used for making the angles .
Hence, the correct option is 2.

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