Perimeter and A...

Two concentric circles form a ring. The inner and outer circumferences of the ring are $$50\dfrac{2}{7}\ m$$ and $$75\dfrac{3}{7}\ m$$ respectively. Find the width of the ring.

If the base and altitude of a parallelogram are doubled, what happens to the area compared to the original one?

Find the area of a ring shaped region enclosed between two concentric circles of radii $$20$$ cm and $$15$$ cm.

Find the area of a parallelogram having base $$4$$ cm and height $$2$$ cm.

The circumference of a circle is $$31.4\ cm$$. Find the area of the circle? (Take $$\pi=3.14$$)

Find the area  of the circular park of Janakpuri whose circumference is 77m77m

Find the area of a circle whose radius is $$6$$ $$cm$$.

If the perimeter of a circle is $$132$$ cm, find its area.

One diagonal of a parallelogram is $$7cm$$ and the perpendicular distance of this diagonal from either of the outlying vertices is $$27cm$$. The area of the parallelogram (in sq.cm) is:

The radius of a circular wheel is $$1.75\ m$$. The number of revolutions that it will make in covering $$11\ kms$$ is: