Construct a line segment $MN$ of length $6 \mathrm{cm}$. Mark any point $O$ on it. Measure $MO, ON$ and $MN$. What do you observe?

Given that $AB=12 \mathrm{cm}$

From the above figure measure the lengths of the following line segments.

(i) $\left(\mathrm{a}\right) CD$ $\left(\mathrm{b}\right) DB$ $\left(\mathrm{c}\right) EA$ $\left(\mathrm{d}\right) AD$

(ii) Verify $\overline{AE}-\overline{CE}=\overline{AC}?$

$AB=3.8 \mathrm{cm}$. Construct $MN$ by compasses such that the length of $MN$ is thrice that of $AB$.

Draw any circle and mark a point $A$ on the circle.

Draw any circle and mark a point $B$ such that it lies in the interior of the circle.