Advertisements
Advertisements
प्रश्न
The circumference of a circle is eigth time the circumference of the circle with a radius of 12 cm. Find its diameter.
Advertisements
उत्तर
Let the radius of the bigger circle = R, and Let the radius of the smaller circle = r.
r = 12 cm
According to the problem,
2πR = 8 × 2πr
2πR = 8 × 2π × 12
R = `(8 xx 2pi xx 12)/(2pi)`
R = 8 × 12
R = 96
Diameter = 2 × 96
= 192 cm
APPEARS IN
संबंधित प्रश्न
Below fig shows a sector of a circle, centre O. containing an angle 𝜃°. Prove that Perimeter of shaded region is 𝑟 (tan 𝜃 + sec 𝜃 +`(pitheta)/180`− 1)
Choose the correct alternative answer for the following question.
The curved surface area of a cylinder is 440 cm 2 and its radius is 5 cm. Find its height.
A wire when bent in the form of an equilateral triangle encloses an area of `121sqrt(3)` cm2. The same wire is bent to form a circle. Find the area enclosed by the circle.
OACB is a quadrant of a circle with centre O and its radius is 3.5 cm. If OD = 2 cm. find the area of
- the quadrant OACB
- the shaded region.
[Take `π = 22/7`.]
Find the area and perimeter of the following semi-circle :
Diameter= 7 cm
A 7 m road surrounds a circular garden whose area is 5544 m2. Find the area of the road and the cost of tarring it at the rate of Rs.150 per sq m.
The speed of the car is 66 km/hour. If each wheel of the car is 140 cm in diameter, find the number of revolutions made by each wheel per minute.
Complete the table below.
| Radius (r) | Diameter (d) | Circumference (c) |
| ...... | ...... | 72.6 cm |
Area of circular garden with diameter 8 m is ______.
