Length of a rectangle is twice of its breadth. Area of the rectangle is $18 \, m^2$. What would be its perimeter? (in $m$)

If the area of a square increases by $69 \%$,then the side of the square increases by (in $\%$)

$ABCD$ is a parallelogram as shown in the figure. Find its area in $cm^2$.

$A$ cylindrical container whose diameter is $12\,cm$ and height is $15\,cm$,is filled with ice cream. The whole ice cream is distributed to $10$ children in equal cones having hemispherical tops. If the height of the conical portion is twice the diameter of its base,find the diameter of the ice-cream cone? (in $cm$)

The perimeter of an equilateral triangle is $72 \sqrt{3} \text{ cm}$. Find its height in meters.

The circumference of a circular field is $440 \, m$. $A$ circular path of $10 \, m$ width runs around the outside of the field. Find the cost of gravelling the path at the rate of $70 \, \text{paise}$ per square metre? (in $Rs.$)