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through M.  MN divide AB into two equal parts. MN bisects AB (that is, divides AB into two equal
                  parts) and is also perpendicular to AB.
                  So MN is the perpendicular bisector of AB.

            Check your understanding: (NCERT, Pg- 97, Exercise – 5.4) (First one is done for you as an example)


                  Q1. What is the measure of (i) a right angle? (ii) a straight angle?
           Answer:  (i) The measure of a right angle is 90°

                       (ii) –

                  Q2. Say True or False:

                   (a) The measure of an acute angle < 90°.
                   (b) The measure of an obtuse angle < 90°.

                   (c) The measure of a reflex angle > 180°.

                   (d) The measure of one complete revolution = 360°.

                   (e) If m∠ A = 53° and m∠ B = 35°, then m∠ A > m∠ B.
           Answer:  (a) True; acute angle is less than 90°.

                   Q3. Measure the angles given below using the Protractor and write down the measure.





































           Answer:  (a) 45°
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