The area of a circle is increased by 22cm2, when its radius is increased by 1cm. The original radius of the circle is.
6cm
3.2cm
3cm
3.5cm
The length of a minor arc is 2/9 of the circumference of the circle. Then the measure of the angle subtended by the arc at the centre of the circle is.
80o
60o
45o
30o
Find the area of the ring shaped region enclosed between two concentric circles of radii 20cm and 15cm.
500cm2
550cm2
620cm2
650cm2
If the perimeter and area of a circle are numerically equal, then the radius of the circle is.
2 unit
π units
4 units
7 units
A wheel makes 1000 revolutions in covering a distance of 88 km. Then, the diameter of the wheel is.
14 cm
24 m
28 m
40 m
The area enclosed between two concentric circles is 770 cm2. If radius of the outer circle is 21 cm, find the radius of the inner circle.
10 cm
12 cm
16 cm
A wheel has diameter 84cm. Find how many complete revolution must it make to cover 792 meters.
100
200
300
400
A chord of a circle of radius 14cm subtends a right angle at the centre. Then, the area of the minor sector is.
154 cm2
156 cm2
158 cm2
160 cm2
If the circumference of a circle is 66 cm, then the area of the circle is.
132 cm2
462 cm2
173.25 cm2
346.5 cm2
If the perimeter and area of a circle are numerically equal, then find the radius of the circle.
1 unit
2 units
3 units
