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
A doorway is decorated as shown in the figure. There are four semi-circles. BC, the diameter of the larger semi-circle is of length 84 cm. Centres of the three equal semicircles lie on BC. ABC is an isosceles triangle with AB = AC. If BO = OC, find the area of the shaded region. (Take `pi = 22/7`)
The minute hand of a clock is √21 𝑐𝑚 long. Find area described by the minute hand on the face of clock between 7 am and 7:05 am
In circle of radius 6cm, chord of length 10 cm makes an angle of 110° at the centre of circle find Circumference of the circle
A square water tank has its side equal to 40m, there are 4 semicircular flower beds grassy plots all around it. Find the cost of turfing the plot at Rs 1.25/sq.m
Find the area of a right – angled triangle, the radius of whose, circumference measures 8 cm and the altitude drawn to the hypotenuse measures 6 cm.
The area of the circle is given below; find the diameter.
176 sq cm
Find the area of the circle if its circumfence is 88 cm.
Find the circumference of the circle whose area is 81π cm 2.
The diameter of a circular field is 56 m. Find its circumference and cost of fencing it at the rate of ₹80 per m. (Take π =`22/7`)
The area of a semicircle of radius 4r is ______.
