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  • Draw an angle of 80° with the help of a protractor. Then construct angles of (i) 40° (ii)160° and (iii) 120°.

Draw an angle  80^{\circ} with the help of a protractor. Then construct angles of 

(i) 40^{\circ} (ii)160^{\circ} and (iii) 120^{\circ}.

Answers (1)

Steps of Construction :

            1.         Draw an angle \angle BAC=80^{\circ} with protractor

            2.         Taking A as the centre, draw a semi-circle with any radius which cuts AB at point G

                        And cuts AC at point F.

            3.         Taking F and G as centres, draw arcs that intersect each other at D.

            4.         Draw AE passing through D.

                        \angle EAB=40^{\circ}

            5.         Draw an arc from F with a radius equal to LF which cuts the previous arc at point H.

                        Then taking H as the centre with the same radius, cut an arc at I.

            6.         Draw lines AK and AJ passing through I and H respectively.

                       \angle KAB=160^{\circ}                                 

                       \angle JAB=120^{\circ}

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