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B
1 and 2
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C
1, 2, 3 and 4
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D
1 and 3
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Solution
The correct option is D 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.