Total ratio = 4+7 = 11
33/11 = 3
4x3 = 12
7x3 = 21
so the two groups are 12:21
which is also = 4:7
<em>You have to plug in all the numbers to the circumference formula and solve!</em>
circumference formula:

<em>or</em>

3.14(12.5) = ?
39.25
<em>The answer is</em>
d. 39.25
The answer is 47 hope i helped