Draw a trapezium ABCD in which AB||DC, AB = 7 cm,

Steps of construction:

Step1: Draw $A B$ equal to $7 \mathrm{~cm}$.

Step2: Make an angle, $\angle A B X$, equal to $60^{\circ}$.

Step3: With $B$ as the centre, draw an arc of $5 \mathrm{~cm}$. Name that point as $C$. Join $B$ and $C$.

Step4: $A B \| D C$

$\therefore \angle A B X+\angle B C Y=180^{\circ}$

$\Rightarrow \angle B C Y=180^{\circ}-60^{\circ}=120^{\circ}$

Draw an angle, $\angle B C Y$, equal to $120^{\circ}$.

Step4: With A as the centre, draw an arc of length 6.5 cm, which cuts CY. Mark that point as D.

Step5: Join A and D.

​Thus, ABCD is the required trapezium.