Question

An outside circular ring has a circumference of 100 cm. What is the circumference of an inner ring which is 5 cm shorter in radius? Both circles have the same center.

Answer 1

do you know the formula for circle's circumference?

use the formula to find the radius of the outside circle, then find the radius of the smaller one, then find its circumference

Answer 2

let radius of outside circle=b
let radius of inside circle =a
general formula for circumference= 2*pi*RADIUS

Answer 3

Find radius of outside circle as you already have the circumference value, given
100= 2*pi*b
solve for b
then use the fact , that radius of inside circle is 5 less than outside, AND find value of its radius "a"
then find circumference of inside circle using 2*pi*a

Answer 4

Im very confused but is the answer 15.92 ?

Answer 5

all necessary steps are given, all youneed to do is plug in values

cant give you the exact answer, unless some effort has been made, sorry

Answer 6

so b = 15.92 ?

Answer 7

yes

Answer 8

now take away 5 from it, thats the value of "a"

Answer 9

ur weird

Answer 10

i don't understand what do u mean?

Answer 11

@sssubzwari , who are you calling weird ? Kindly read before making a comment