An archery target has 3 regions formed by 3 concentric circles. If the diameters of concentic circles are in the ratio 1:2:3, then_______ is ratio of areas of 3 regions.

If the sum of the areas of 2 circles with R1 and R2  is equal to the area of a circle of Radius R then R₁²+R₂²=R²

It is proposed that to build a single circular part equal in area to the sum of areas of 2 circular parks of diameter 16 m and 12 m in a locality. The radius of new park would be in m.

If the perimeter of circle is equal to that of a square. Then the ratio of their areas is equal to_______

A plot is in the form of rectangle ABCD having semicircle on BC. If AB=60 and BC=28. Find the area of plot in m².

A rectangular piece is 20 m long and 15 m wide, from its four corners, quadrants of 3.5 m radius have been cut. find the area of the remaining part in m².

A road which is 7 m wide surrounds a circular park whose circumference is 352 m. Find the area of the road in m².

Four equal circles each of radius a touch each other. The area between them is 6a²/7.

Find the area of sector of a circle of radius 28 cm and central angle 45^o in cm².

A cow is tied with a rope of length 14m at the corner of a rectangular field of dimension 20m16m. Find the area of field in which cow can graze in m².