Question

Draw an angle of ${80}^{\circ }$ with the help of a protractor and disect it. Measure each part of the bisected angle.

Answer 1

Steps of construction
1. Draw $\angle AOB$ = ${80}^{\circ }$ using protractor.
2. With O as centre and a convenient radius, draw an arc cutting AO at N and OB at M.
3. With N as centre and a convenient radius, draw an arc.
4. Similarly, with M as centre and same radius, cut the previous drawn arc and name it as point C.
5. Join OC.
OC is the required angle bisector.
On measuring we get
$\angle AOC$ = $\angle BOC$ = ${40}^{\circ }$