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Question

Which of the following options are correct?
1) If each angle of a polygon is less than 180, it is called convex polygon.
2) If each angle of a polygon is more than 180, it is called concave polygon.
3) If at least one angle of a polygon is more than 180, it is called concave polygon.
4) If at least one angle of a polygon is less than 180, it is called convex polygon.

A
(1) and (4)
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B
(2) and (4)
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C
(3) and (4)
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D
(1) and (3)
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Solution

The correct option is D (1) and (3)
If each angle of a polygon is less than 180, it is called convex polygon.
If at least one angle of a polygon is more than 180, it is called concave polygon.
So, (1) and (3) are correct.

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