Perimeter and A...

A circular park is surrounded by a road $$21\ m$$ wide. If the radius of the park is $$105\ m$$, find the area of the road.

The perimeter of a quadrant of a circle of radius $$r$$ is:

The base and the corresponding altitude of a parallelogram are $$10\: cm$$ and $$3.5\: cm$$, respectively. The area of the parallelogram is

If the base of a parallelogram is $$8\ cm$$ and its altitude is $$5\ cm$$, then its area is equal to

A circular grassy plot of land, 42 m in diameter, has a path 3.5 m wide running around it on the outside. Find the cost graveling the path at Rs 4 per square meter.

In fig. 3, the area of the shaded region is :

If a circular grass lawn of $$35\ m$$ in radius has a path $$7\ m$$ wide running around it on the outside, then the area of the path is

A pond that is $$100$$ m in diameter is surrounded by a circular grass walk that is $$2$$ m wide. How many square meters of grass is there for the walk?

Find the area of a circular ring formed by two concentric circles whose radii are $$5.7\ cm$$ and $$4.3\ cm$$ respectively (Take  $$\pi =3.1416$$)

A track is in the form of a ring whose inner circumference is $$352\ m$$ and the outer circumference is $$396\ m$$. The width of the track is: