Area Related to...

The geometric shape that has no corners is _____.

A shuttlecock used for playing badminton has the shape of a combination of

The figure below shows two concentric circles with centre $$O$$. $$PQRS$$ is a square inscribed in the outer circle. It also circumscribes the inner circle, touching it at point $$B, C, D$$ and $$ A$$. The ratio of the perimeter of the outer circle to that of polygon $$ABCD$$ is

If a sector of a circle of diameter $$21\ cm$$ subtends an angle of $$120^{\circ}$$ at the centre, then what is its area ? 

Four circular cardboard pieces of radii $$7 cm$$ are placed on a paper in such a way that each piece touches other two pieces. The area of the  region enclosed between these pieces   is

What is the area of the sector A' OB' if radius of circle is equal to $$6$$ cm and $$\angle AOB =60^{\circ}$$.

The area of the shaded region in the given

figure is:

Find the area of a sector of a circle of radius $$28\ cm$$ and central angle $$45^{\circ}$$.

If the sector of a circle of diameter $$10\ \text{cm}$$ subtends an angle of $$144^{\circ}$$ at the centre, then the length of the arc of the sector is