Using your protractor, draw an angle of 108°.
Question:

Using your protractor, draw an angle of 108°. With this given angle as given, draw an angle of 54°. 

Solution:

Steps of construction:

1. Draw an angle ABC of 108°.

2. With B as the center and any radius draw an arc which intersects AB at P and BC at Q.

3. With P as center and radius more than half of PQ draw an arc.

4. With Q as the centre and same radius draw an arc which intersects the previous arc at R.

5. Join BR.

Therefore ∠RBC = 54° 

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