Question 1 :
The angle of sector with area equal to one fifth of total area of whole circle 
Question 2 :
Lengthof an arc of a circle with radius $r$ and central angle $\theta$is(angle in radians):
Question 3 :
If the diameter of a circle is increased by 200% then its area is increased by<br>
Question 4 :
The diameter of a wheel of a cycle is 21 cm How far will it go in 28 complete revolutions?
Question 5 :
Given, $\displaystyle A = \frac{S}{360}\times \pi r^2$<br/>$A$ is the area of setor, $ S$ is the angle measure in degrees of the sector and $r$ is the radius of the circle. Find $r$ in terms of $A$ and $S$.
Question 6 :
In a circle of radius 21 cm an arc subtends an angle of $\displaystyle 56^{\circ} $ at the centre of the circle. The length of the arc is
Question 7 :
The length of minor arc $\widehat {AB}$ of a circle with radius $7$ units  is $14$. Find the length of major arc $\widehat {AB}$.
Question 8 :
The circumference of a circular field is $308 m$. Find its radius in metres.
Question 9 :
The region between an arc and two radii joining the centre to the end points of the arc is called
Question 10 :
If the number of units in the circumference of a circle is same is same as the number of units in the area then the radius of the circle will be
Question 11 :
If the circumference of a circle is$\displaystyle \frac{30}{\pi }$ then the diameter of the circle is
Question 12 :
In covering a distance s meters, a circular wheel of radius r m makes $\dfrac{s}{2\pi r}$ revolutions. Is the statement true ? Why ?
Question 13 :
There are two circular gardens A and B. The circumference of garden A is $1.760 km$ and the area of garden B is $25$ times the area of garden A. Find the circumference of garden B.
Question 14 :
If the circumference of a circle is reduced by $50\%$ the area of the circle is reduced by:
Question 15 :
If the radius of a circle is increased $100$%, the area is increased.
Question 16 :
Let a semicircle with centre O and diameter AB. Let P and Q be points on the semicircle and R be a point on AB extended such that OA =QR < PR. If $\widehat{POA} = 102^0$ then $\widehat{PRA} $ is
Question 17 :
The ratio of the circumference of a circle to twice the diameter of the circle is 
Question 18 :
What is the area of a circle with a diameter of $16$?<br/>
Question 19 :
If the area of a circle is halved when its radius is decreased by n then the radius is equal to
Question 20 : <p>If the circumference of a circle is $8$ units and arc length of major sector is $5$ units then find the length of minor sector.</p>
