Advertisements
Advertisements
Question
The radius of two circles are in the ratio 3 : 5, find the ratio between their circumferences.
Solution
The ratio of the radius of the circles = 3 : 5
Let the radius of the first circle = 3x
and radius of the second circle = 5x
∴ Circumference of the first circle = 2πr
= 2π × 3x = 6πx
and circumference of the second circle = 2πr
= 2π × 5x = 10x
∴ The ratio between their circumference
= 6πx : 10πx
= 6 : 10
= 3 : 5
APPEARS IN
RELATED QUESTIONS
In circle of radius 6cm, chord of length 10 cm makes an angle of 110° at the centre of circle find Area of the circle
Find the perimeter of a semicircular protractor whose diameter is 14 cm.
In the given figure, ABCD is a trapezium of area 24.5 cm2 , If AD || BC, ∠DAB = 90°, AD = 10 cm, BC = 4 cm and ABE is quadrant of a circle, then find the area of the shaded region.
Find the circumference of the circle whose area is 25 times the area of the circle with radius 7 cm.
A conical tent with a capacity of 600 m3 stands on a circular base of area 160 m2 Find in m2 the area of the canvas.
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.
The speed of a car is 66km per hour. If each wheel of the car is 140cm in diameter, find the number if revolution made by each wheel per minute.
The diameter of a circular well is 4.2 m. What is its circumference?
Circumference of a circle disc is 88 cm. Its radius is ______.
