Question 178924
A wire is bent in a shape of a square of side 4cm. The wire is again bent into the shape of a circle.Find the radius of the circle.


The key is that the circumference of the square and the circumference of the circle are the same.

C of square = 4 sides * 4 cm = 16 cm


C of circle = 2*pi*r
You know the C of the circle is 16 cm so:
{{{16=2*pi*r}}}
Simplifying: {{{r = 16/(2*pi)}}}
r=2.55 cm