Question

The circumference of two concentric circles are 121 cm and 154 cm. Calculate the difference between their radii
​

Answer 1

QUESTION :-

$\huge\bold\pink\bigstar$The circumference of two concentric circles are 121 cm and 154 cm. Calculate the difference between their radii.

________________________

ANSWER:-

$\huge\bold\red\rightarrow$let the radius of smaller circle be r1 & that it the larger circle be r2.

$\huge\bold\red\rightarrow$ circumference of the smaller circle ,C1=121cm.

THEREFORE,

$\huge\bold\red\rightarrow$2πr1=121cm.

$\huge\bold\red\rightarrow$ Circumference of larger circle, c2 = 154 cm

$\huge\bold\red\rightarrow$2 πr2 = 154

$\huge\bold\red\rightarrow$Subtracting (1) from (2) , we get:

$\huge\bold\red\rightarrow$2 x 22/7(r2 - r1) = 154 - 121

$\huge\bold\red\rightarrow$.°.(r2-r1)=33×7/2×22

$\huge\bold\red\rightarrow$.°.(r2-r2)=3×7/2×2

$\huge\bold\red\rightarrow$.°.(r2-r1)=21/4.

________________________

.°.$\huge\bold\purple\bigstar$r2-r1=21/4.

________________________

Answer 2

hey!

☆☆Refer to the attachment please