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An angle which is greater than $90 °$ and less than $180 °$ is called

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a right angle

a straight angle

an acute angle

an obtuse angle

answer is D.

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Detailed Solution

We need to find an angle which is greater than

90^{\circ}

and less than

180^{\circ}

.
We know that,
A right angle measures

90 ° .

An acute angle measures more than

0 °

but less than

90 ° .

An obtuse angle measures more than

90 °

but less than

180 ° .

A straight angle measures

180 ° .

Therefore, an angle which is greater than

90 °

and less than

180 °

is called obtuse angle.
Hence, option (4) is correct.

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