Question

the diameter of two concentric circles are 98 cm and 12 cm find the difference between theory parameters​

Answer 1

Answer:

Given circumferences of are circles are 12cm and 72cm respectively.

formula of circumference of a circle is 2πr [Here r is thr radius of a curcle]

and π=3 [given]

circumference of first circle= 2πr =2X3Xr1=12

r1=2cm

circumference of second circle= 2πr =2X3Xr2=72

r2=12cm

Difference bw radii=r2−r1=12−2=10cm

So, option B is the answer.