Question

A dartboard has a circumference of 78.5 in.What is the diameter?

Answer 1

`2 \pi r = circumference`
so,

`(circumference)/(2 \pi ) = radius`

it equals 12.49 or 12.5 depending on rounding


I hope this helps!

Answer 2

Answer: 25 inches.

Explanation:

The circumference of a circle is given by :-

`C=\pi d`, where d is the diameter.

Given : A dartboard has a circumference of 78.5 in.

Then, we have

`\pi d=78.5`

We put
`\pi=3.14` in the above equation, we get

`(3.14) d=78.5\\\\\Rightarrow\ d=(78.5)/(3.14)\\\\\Rightarrow d=25`

Hence, the diameter of the dart board = 25 inches.