Construct a rhombus the length of whose diagonals are $6 \mathrm{cm}$ and $8 \mathrm{cm}$.

Construct a rhombus $\mathrm{ABCD}$ in which $\mathrm{AB}=4 \mathrm{cm}$ and diagonal $\mathrm{AC}=6.5 \mathrm{cm}$.

Draw a rhombus whose side is $7.2 \mathrm{cm}$ and one angle is $60°$.

Draw a trapezium $ABCD$ in which $AB\parallel CD$, $AB=7 \mathrm{cm}, BC=5 \mathrm{cm}, AD=6.5 \mathrm{cm}$ and $\angle B=60°$.

Define the terms: $\left(\mathrm{i}\right)$ Open curve $\left(\mathrm{ii}\right)$ Closed curve $\left(\mathrm{iii}\right)$ Simple closed curve

The angles of a quadrilateral are in the ratio $1:2:3:4$. Find the measure of each angle.

Two adjacent angles of a parallelogram are the ratio $2:3$. Find the measure of each of its angles.

The sides of rectangle are in the ratio $4:5$ and its perimeter is $180 \mathrm{cm}$. Find its sides.