#1**+3 **

I'm assuming by c you mean the circumference, and d is the diameter.

The circumference of any circle is the diameter times pi.

Here, I'll write pi as 3.14 because if I was to write it out it would take forever (quite literally).

C = D * 3.14

7.85 m = D * 3.14

D = 7.85 / 3.14 = **2.5 m**

**The diameter was 2.5 m** :D

CentsLord Apr 28, 2020