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    E:\Working\Orange_Education\TouchPad_Maths_4\Open_Files\Chap_07\Chap_07
                 \ 10-Nov-2025  Bharat Arora   Proof-8                                     Reader’s Sign _______________________ Date __________

                Look around and list any five things where you see angles.

                               S. No.                                 Name of objects
                                   1                         ____________________________

                                  2                          ____________________________

                                  3                          ____________________________
                                  4                          ____________________________

                                  5                          ____________________________

                Right Angles                                                                    Century   #Experiential Learning
                                                                                                  21 st
                Let us make a right angle.                                                       Skills

                Take a piece of paper and fold it as shown in the
                picture. You will get a right angle.
                Observe your room and find out where you see
                right angles.                                                                               Right Angle

                Acute and obtuse Angles

                Identify the angles that you think are right angles and circle them in the dot grid given
                below. Check using your right angle checker.

                                            b
                                                                                                     Tips
                                                                          d
                          a
                                                        c                                  An  angle greater than
                                                                                           a right  angle is  called
                                                                                           an obtuse  angle while
                                                                                           an angle smaller  than
                                                                                           a right  angle is  called
                                                                                           an acute angle.
                                                                                                         acute
                                          f                 g
                       e                                                     h             Obtuse

                Here, angles b, c, e and h are right angles. Angles a and d are greater than a right
                angle. These are called obtuse angles. Angles f and g are smaller than a right angle.
                These are called acute angles.

                       120       Mathematics 4

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