Using protractor, draw a right angle. Bisect it to get an angle of measure 45°.
Steps of construction:
1. Draw an angle ABC of 90°
2. With center B and any radius, draw an arc which intersects AB at P and BC at Q
3. With center P and Q and radius more than `1/2`PQ draw two arcs, which intersect each other at R.
4. Join RB
∴ `∠`RBC = 45°
Concept: Basic Constructions
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