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Which of the following is less than a right angle ?

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answer is A.

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Detailed Solution

To find: the angle which is less than a right angle.

We know that a right angle is an angle which measure $90 °$

From the given figures, we can say that option B is a right angle since it measures $90 °$

Also, angles in options D and C are greater than $90 °$

Therefore, the angle which is less than a right angle is $60 °$

Hence, the correct option is option A.

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