We take a one-metre rod and mark 4 points on it such that each segment is of equal length.
If we take OA to be X units, then X units are equal to:
If we mark 4 points then there will be 5 parts on the scale.
We know 1 m = 100 cm
If one-metre is divided into five equal parts then each part measures 15 m.
∴Each part=1005 cm
⇒ Each part=20 cm.