Areas Related to Circles Quiz 1

The area of a circle, whose circumfrence is 22 cm, is:

Area of a sector of angle p (in degrees) of a circle with radius R is :

The radii of two concentric circles are 4 cm and 5 cm. The difference in the areas of these two circles is:

If the circumference of a circle is 44 cm then its area  is:

A wire is in the shape of a circle of radius 21 cm. It is bent to form a square. The side of the square is:

If a square ABCD is inscribed in a circle of radius 'r' and AB = 4 cm, then the value of r is:

If the difference between the circumference and radius of a circle is 37 cm, then the circumference (in cm) of the circle is: (using $\pi=\frac{22}7$)

An arc of a circle is of length $5\pi\,cm$ and the sector it bounds has an area of $20\pi\,cm^2.$ Then the radius of the circle is:

The perimeter of a circle is equal to that of a square, then the ratio of their areas is

Area of the largest triangle that can be inscribed in a semi-circle of radius r units is

If the circumference of a circle and the perimeter of a square are equal, then

If the sum of the circumferences of two circles with radii $R_1\;and\;R_2$ is equal to the circumference of a circle of radius R, then

If the area of a circle is $154\,cm^2,$ then its perimeter is

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

The area of the circle that can be inscribed in a square of side 6 cm is