Which angles in the following figure are acute ?

1 and 2

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2 and 4

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1 and 3

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1, 2, 3 and 4

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Solution

The correct option is C 1 and 3
In the given figure, angles 1 and 3 are less than 90°, and hence are acute angles. Angles 2 and 4 are greater than 90° and less than 180°, and hence are obtuse angles.

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