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Question

Draw an angle of 60° using ruler and compasses and divide it into four equal parts. Measure each part.

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Solution

Step 1: Construct angle of 60°

Step 2: Construct bisector to ∠RPQ
  • With P as centre, draw an arc of radius more than the half of AB such that it intersects rays PR and PQ at A and B respectively.
  • Without disturbing the radius of compass, taking A and B as centres draw arcs which intersects each other the interior of the angle at D.
  • Join PD.
Step 3: Construct bisector to ∠RPD and ∠DPQ
  • Now set the radius of compass as more than half of AC.
  • With A and C as centres. Draw arcs such that they intersect each other at interior of angle APD.
  • Let us name the intersection point as E.
  • Similarly, without disturbing the radius of compass draw arcs considering C and B as centres.
  • Let these arcs intersect at F.
  • Join PE and PF.
  • Thus, PD, PE, PF divides the angle 60° into four equal parts.From this construction, we can observe that perpendicular bisector DE passes through the centre of the circle.
On measuring the divided parts.

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