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Which one of the following is not an acute triangle?

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answer is B.

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Detailed Solution

We have been asked to identify the triangle that is not acute.
An acute triangle is a triangle whose all the angles are acute, that is less than

90^{o}

.
From the given options we see that in the triangle,
Question Image

Only two angle is less than

90^{o}

and one is more than

90^{o}

so, it is not an acute triangle.
The remaining triangles have all the angles less than

90^{o}

so they are all acute triangles.
Thus, the second figure is therefore not an acute triangle.
Therefore, option 2 is correct.

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