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    Which of the following statements is wrong ?
    Question

    Which of the following statements is wrong ?

    A.

    An angle whose measure is 90°, is called right angle.

    B.

    An angle whose measure is greater than 90° and less than 180°, is called obtuse angle.

    C.

    An angle whose measure is 180°, is called reflex angle.

    D.

    An angle whose measure is less than 90°, is called an acute angle.

    Correct option is C

    Given
    Definitions of different types of angles.
    Formula / Concept used
    · Acute angle: less than 90°
    · Right angle: exactly 90°
    · Obtuse angle: greater than 90° and less than 180°
    · Straight angle: exactly 180°
    · Reflex angle: greater than 180° and less than 360°
    Solution
    Statement (c) says that an angle of 180° is a reflex angle, which is incorrect. An angle of 180° is called a straight angle, not a reflex angle.
    The correct option is (c)

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