Question
Use a pair of compasses and construct the following angles:
$67\frac{1}{2}^\circ$

Answer


Steps of Construction:
  1. Draw a ray OA.
  2. With O as centre and any suitable radius draw an arc above OA to cut it B.
  3. With B as centre and same radius cut the previous arc at C and then with C as centre and same radius cut the arc at D.
  4. With C as centre and radius more than half CD draw an arc.
  5. With D as centre and same radius draw another arc to cut the previous arc at E.
  6. Join OE. Then $\angle\text{AOE}=90^\circ.$
  7. Draw the bisector OF of $\angle\text{AOE}.$
  8. Draw the bisector OG of $\angle\text{EOF}.$
Then, $\angle\text{AOG}=67\frac{1}{2}^\circ$ is the required angle.

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