Advertisements
Advertisements
Question
The radius of two circles are 20 cm and 13 cm. Find the difference between their circumferences. (Take π =`22/7`)
Advertisements
Solution
Radius of 1st circle = 20 cm
Circumference of the circle = 2πr
= `2xx22/7xx20`
= `40 xx 22/7`
= 125.7 cm
The radius of 2nd circle = 13 cm
Circumference of the circle = 2πr
= `2xx22/7xx13`
= `26 xx 22/7`
= 81.7
∴ The difference of circumference of two circles
= 125.7 − 81.7 cm = 44 cm
APPEARS IN
RELATED QUESTIONS
Given figure depicts an archery target marked with its five scoring areas from the centre outwards as Gold, Red, Blue, Black and White. The diameter of the region representing Gold score is 21 cm and each of the other bands is 10.5 cm wide. Find the area of each of the five scoring regions. [use π = 22/7]
The radius of the wheel of a vehicle is 42 cm. How many revolutions will it complete in a 19.8-km-long journey?
The diameters of the front and rear wheels of a tractor are 80 cm and 2 m respectively. Find the number of revolutions that a rear wheel makes to cover the distance which the front wheel covers is 800 revolutions.
A cylindrical bucket, whose base radius is 20 cm, is filled with water to a height of 25 cm. A heavy iron spherical ball of radius 10 cm is dropped to submerge completely in water in the bucket. Find the increase in the level of water.
Find the total surface area and volume of a hemisphere whose radius is 10 cm.
Find the circumference of the circles whose radii are given below.
91 mm
In the formula, C = 2πr, ‘r’ refers to
Areas of two circles are equal. Is it necessary that their circumferences are equal? Why?
The area of a semicircle of radius 4r is ______.
Value of π is ______ approximately.
