Mention the properties of isosceles trapezium.

The sides of a rectangle are in the ratio  $3:5$. If the area of the rectangle is  $960 {\mathrm{m}}^2$, then what is the perimeter of this rectangle?

The area of square field is $1764 {\mathrm{m}}^2$. How much will it cost to build a wall around it at the cost of $₹240$ per metre?

The area of a parallelogram is the same as that of a square of side $12 \mathrm{cm}$. If one side of the parallelogram is $16 \mathrm{cm}$ long, then if its height with this side as the base is $\mathrm{k} \mathrm{cm}$, then find the value of $\mathrm{k}$.

The area of trapezium is $384 {\mathrm{m}}^2$.  Its height is $12 \mathrm{m}$. One side of the trapezium is longer than the other parallel side by $16 \mathrm{m}$. Find the length of the two parallel sides.​​​​​​​

$ABC$ is a triangle in which the base $BC$ is $24 \mathrm{cm}$ and the altitude from $A$ to $BC$ is $20 \mathrm{cm}$. If the area of the triangle is $k {\mathrm{cm}}^2$, then find the value of $k$.