Chapter 12 – Areas Related to Circles

The circumference of a circle exceeds its diameter by 120cm, then its radius is

The area of a circle is 2464 sq. cm, then its diameter is given by

The diameter of a wheel is 1.26 m. The distance travelled in 500 revolutions is

The area of a sector of a circle with radius 21cm and sector angle 120° is

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

The ratio of the areas of the incircle and circumcircle of a square is

If the area of a circle is numerically equal to twice its circumference, then the diameter of the circle is:

The ratio of area of two circles whose ratio of circumference is 3:1 will be

If the area of a circle is 154 \(cm^{2}\), then its perimeter is

The area of a sector of a circle bounded by an arc of length 5π cm is equal to 20π \(cm^{2}\), then its radius is

The area of a circle whose circumference is 22 cm, is

If the radius of a circle is increased by 100%, then its area is increased by

The perimeter of a semicircular protractor whose radius is 7cm is

If ‘r’ is the radius of a circle, then its perimeter is given by

The area of the circle that can be inscribed in a square of side 10cm 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 distance covered by a circular wheel of diameter ‘d’ in 100 revolutions is

The diameter of a wheel is 1.26 m. The distance travelled in 500 revolutions is

The area of the square that can be inscribed in a circle of radius 12 cm is

The perimeter (in cm) of a square circumscribing a circle of radius a cm, is

The radii of two circles are 4 cm and 3 cm respectively. The diameter of the circle having area equal to the sum of the areas of the two circles (in cm) is:

The radii of two circles are 19 cm and 9 cm respectively. The radius of the circle which has circumference equal to the sum of the circumference of two circles is

23. The area of the circle is 154 \(cm^{2}\). The radius of the circle is

24. If angle of sector is 60°, radius is 3.5 cm then length of the arc is

25. The area of a quadrant of a circle whose circumference is 22 cm, is

26. If 0 is the angle in degrees of a sector of a circle of radius V, then area of the sector is

27. A horse is tied to a peg at one corner of a square shaped grass field of side 15 m by means of a 7 m long rope. The area of that part of the field in which the horse can graze, is

28. The area of the circle whose diameter is 21 cm is

29. The area of the sector of a circle with radius 6 cm and of angle 60° is

30. The area of a circle whose circumference is 22 cm, is