Question

The area of the circle is 15 times the area of another circle. Find the ratio of their circumference​

Answer 1

explanation:

$\pi { r_{1}}^{2} = 15\pi { r_{2} }^{2} \\ \frac{ r_{1}}{ r_{2}} = \frac{ \sqrt{15} }{1}$

answer is:

$\frac{ \sqrt{15} }{1}$