Advertisements
Advertisements
प्रश्न
If radius of a circle is increased to twice its original length, how much will the area of the circle increase?
विकल्प
1.4 times
2 times
3 times
4 times
Advertisements
उत्तर
4 times
Explanation:
Let r be the radius of the circle.
∴ Area of circle = π2
If radius is increased to twice its original length, then radius will be 2r.
Now, area of new circle = π(2r)2 = 4π2 = 4 times of original area
Hence, the area of circle will be increased by 4 times.
APPEARS IN
संबंधित प्रश्न
The area of sector is one-twelfth that of the complete circle. Find the angle of the sector .
A chord PQ of length 12 cm subtends an angle of 120° at the centre of a circle. Find the area of the minor segment cut off by the chord PQ.
What is the angle subtended at the centre of a circle of radius 6 cm by an arc of length 3 π cm?
Write the formula for the area of a segment in a circle of radius r given that the sector angle is \[\theta\] (in degrees).
In the following figure, the area of the shaded region is
In the given figure, O is the centre of the circle with AC = 24 cm, AB = 7 cm and ∠BOD = 90°. Find the area of shaded region.
The areas of two concentric circles are 1386 cm2 and 962.5 cm2. The width of the ring is
A circular field of radius 105 m has a circular path of uniform width of 5 m along and inside its boundary. Find the area of the path.
Find the area enclosed between two concentric circles, If their radii are 6cm and 13cm respectively.
If the radius of a circle is doubled, its area becomes ____________.
