1. Which of the following are true?
(i) A convex quadrilateral has all the angles less than 180°.
(ii) A concave quadrilateral has an angle greater than 180°.
(iii) The sum of four angles of a quadrilateral is equal to five right angles.
(iv) A convex quadrilateral may have a reflex angle.
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3 the sum of of four angles of a quadrilateral is equal to five right angles
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