Perimeter and A...

The following figure shows a square cardboard $ABCD$ of side $28\ cm.$ Four identical circles of the largest possible size are cut from this card as shown below.
Find the area of the remaining cardboard.

The area of a circle is $\displaystyle 2464\:m^{2}$, then the diameter is 

If the difference between the circumference and diameter of a circle is $30 cm$ then what is the radius of the circle?

The area of a circular plot is $3850$ square meters. What is the circumference of the plot ?

In the given figure, the area enclosed between two concentric circles is $808.5\ cm^2$. The circumference of the outer circle is $242\ cm$. Calculate the radius of the inner circle

The area enclosed between two concentric circles is $770$ $cm^2$. If the radius of the outer circle is $21$ $cm$, calculate the radius of the inner circle.

The inner circumference of a circular track $14\ m$ wide is $440\ m$. The radius of the outer circle is

Find the the perimeter of the figure given correct to one decimal place.

What is the perimeter of the given figure correct to one decimal place?