Aim: Making a protractor showing angles of 0°, 22½°, 45°, 67½° , 90° etc. using a piece of paper.
Material required: A piece of thin paper, a sharp pencil, scale.
Procedure:
1) Take a piece of thin semicircular paper such that the diameter is AB
2) Now fold the paper in such a way that A falls on B and a crease is formed in such a way that point of intersection of diameter with the crease is at a point O. The angle formed at point O is 90°
3) If we fold, this angle to half we get an angle of 45°
4) If we fold further, this angle to a half we get an angle of 22½°
Observation: On opening the sheet of thin paper, we get a protractor with angles 0°, 22½°, 45°, 67½° , 90°
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