Question

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

Answer 1

Answer: 25 inches.

Step-by-step 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

$(3.14) d=78.5\\\\\Rightarrow\ d=\dfrac{78.5}{3.14}\\\\\Rightarrow d=25$

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

Answer 2

$2 \pi r = circumference$
so,
$\frac{circumference}{2 \pi } = radius$

it equals 12.49 or 12.5 depending on rounding


I hope this helps!