Areas Related to Circles

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

Area of a circle of radius $r$ is given by:

The area of a quadrant of a circle whose circumference is 22 cm is:

If the radius of a circle is doubled, its area becomes:

The length of an arc of a sector of angle $\theta$ in a circle of radius $r$ is:

The area of a sector of angle $p$ (in degrees) of a circle with radius $R$ is:

If the perimeter and the area of a circle are numerically equal, then the radius of the circle is:

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

The area of a sector of angle $60^\circ$ of a circle with radius 6 cm is:

If the sum of the areas of two circles with radii $R_1$ and $R_2$ is equal to the area of a circle of radius $R$, then:

What is the angle of a semicircle?

The minute hand of a clock is 14 cm long. The area swept by the minute hand in 5 minutes is:

If the perimeter of a semicircle is 36 cm, then its radius is (using $\pi = \frac{22}{7}$):

The area of a circle is $616\text{ cm}^2$. Its diameter is:

Area of a minor segment of a circle is equal to:

If the radius of a circle is decreased by 50%, then its area is decreased by:

The wheels of a car are of diameter 80 cm each. How many complete revolutions does each wheel make in 10 minutes when the car is travelling at a speed of 66 km/h?

The area of the greatest circle that can be inscribed in a square of perimeter 24 cm is:

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

The radii of two circles are 8 cm and 6 cm respectively. The radius of the circle having area equal to the sum of the areas of the two circles is: