Perimeter and A...

Calculate the area of a circular ring whose outer and inner radii are $$12$$ and $$10\ cm.$$

Find the width of the ring.

The diameter of a circle is $$1$$. Calculate the area of the circle.

Find the area of the shaded portion

The radius of a circle whose circumference is $$\pi$$ is

The area of the parallelogram $$ABCD$$ is

What is the area of a circle with a diameter of $$16$$?

In the figure given above, $$\overline {AC}$$ is a diameter of the large circle and B lies on $$\overline {AC}$$ so that $$\overline {AB}$$ is a diameter of the small circle. If $$AB = 1$$ and $$BC = 2$$, Calculate the area of the shaded region.

A circle of radius $$x$$ has an area twice that of a square of side $$ a.$$ The equation used to find the radius of the circle is

The figure shows a rectangle $$ABCD$$.
Calculate the unshaded area.