Advertisements
Advertisements
Question
The circumferences of two circles are in the ratio 5: 7, find the ratio between their radius.
Solution
The ratio of the circumference of the circle = 5: 7
Let circumference of the first ratio = 5x
∴ 2πr = 5x
⇒ r =`(5"x")/(2π)`
and the circumference of the second ratio = 7x
∴ 2πr = 7x
⇒ r = `(7"x")/(2π)`
The ratio between their radius =`(5"x")/(2π):(7"x")/(2π)`
= 5: 7
APPEARS IN
RELATED QUESTIONS
The side of a square is 10 cm. find the area of circumscribed and inscribed circles.
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.
The area of a circle is 38.5 cm2. The circumference of the circle is
Find the circumference of the circle whose area is 25 times the area of the circle with radius 7 cm.
Find the diameter of the sphere for the following :
Volume = `523 17/21` cm3
A circular racing track has inner circumference 528 m and outer circumference 616 m. Find the width of the track.
The area of a circle whose circumference is 22 cm, is ____________.
Circumference of a circle of diameter 5 cm is ______.
ABCD is a given rectangle with length as 80 cm and breadth as 60 cm. P, Q, R, S are the midpoints of sides AB, BC, CD, DA respectively. A circular rangoli of radius 10 cm is drawn at the centre as shown in the given figure. Find the area of shaded portion.
The circumferences of two circles are in the ratio 4 : 5. What is the ratio of their radii?
