Question

The diameter of a circle is 69 yards. The circle's circumference is about ___ yards. Use 3.14 for π.

Answer 1

The circumference of circle is ,

`C=2\Pi r`

where r is the radius of circle.

The diamteter of circle is , 69 yards

Convert into radius,

`d=2r`
`69=2r`
`r=(69)/(2)`

Substitute the radius in the circumference formula.

`C=2*3.14*(69)/(2)`
`C=3.14*69`
`C=216.66\text{ yards.}`

Hence the circumference of circle is 216.66 yards.