Question

out of reach of wire 121 cm long rings are made of diameter 3.5 cm each find the number of rings that can be made of it​

Answer 1

11 rings can be made of it.

Step-by-step explanation:

Given that, the length of the wire is 121 cm

and the diameter of a ring is 3.5 cm

Then the circumference of each ring is

= π * 3.5 cm

= 22/7 * 3.5 cm

= 22 * 0.5 cm

= 22/2 cm

= 11 cm

Let n number of rings can be made from the wire.

According to the question,

11n = 121

or, n = 121/11

or, n = 11

Therefore 11 rings can be made of the wire.

Answer 2

$n\times$circumference of circle = total length of wire

Step-by-step explanation:

total length of wire = 121 cm

diameter of each ring = 3.5 cm, radius of each ring = 3.5÷2 =

so, using above relation

$n\times$circumference of circle = total length of wire

n× 2πr = 121

n×2×(22÷7)×3.5÷2 = 121

n = 11

so total 11 rings are used