Explain the correct way of measuring the length of a table.

Draw the diagram of a man riding a bicycle on a straight track and mark the different motions like
(i) Motion of the man on the track
(ii) Motion of the wheels of the cycle
(iii) Motion of the legs on the pedal.

A $20 \mathrm{cm}$ scale has a broken end and begins from $1.5 \mathrm{cm}$. Which mark of this scale will you use to measure length of an object?