Advertisements
Advertisements
प्रश्न
The circumference o a garden roller is 280cm. How many revolutions does it make in moving 490m?
Advertisements
उत्तर
The Circumference of a Circle
= 280cm
= 2.8m
Number of revolutions
= `"Total distance moved"/"CIrcumference of Circle"`
= `(490)/(2.8)`
= 175.
APPEARS IN
संबंधित प्रश्न
The inner circumference of a circular track is 220 m. The track is 7m wide everywhere. Calculate the cost of putting up a fence along the outer circle at the rate of j – 2 per metre. (Use π = 22/7)
A horse is placed for grazing inside a rectangular field 70 m by 52 m. It is tethered to one corner by a rope 21 m long. On how much area can it graze? How much area is left ungrazed?
The radius of the wheel of a vehicle is 42 cm. How many revolutions will it complete in a 19.8-km-long journey?
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
- quadrant OACB
- the shaded region.
A wire when bent in the form of a square encloses an area of 484 cm2. If the same wire is bent into the form of a circle, find the area of the circle.
The circumference of a circle is equal to the perimeter of a square. The area of the square is 484 sq. m. Find the area of the circle.
Find the area and perimeter of the following semi-circle :
Diameter= 5.6 cm
Two circles touch each other externally. The sum of their areas is 5811 cm2 and the distance between their centres is 10 cm. Find the radii of the two circles.
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.
Find the circumference of the circle whose area is 25times the area of the circle with radius 7cm.
