Question

Can you please help me out with a question

Answer 1

So, the surface area of a sphere is

$A\text{ = 4}\pi r^2$

so, you have the value of A, and the value of pi, now you want to resolve for r

$615.752\operatorname{mm}^2\text{ = }4\pi r^2$$\sqrt[]{(\frac{615.752\operatorname{mm}}{4\cdot\pi})}\text{ = r}$

Then, r = 6.9999999mm... and the ask you to approximate to a whole number

the answer is r = 7mm