Hi guys, I came across this question and just need a little push I think..
If we have a circle inside a square so that the sides of the square lie tangent to the circle, find the rate of change of the perimeter of the square if the rate of change of the circumference of the circle is 6ms^-1.
I've tried to write the circumference as 2pi*r
so d/dt (2pi*r) = 6 which obviously isn't right, maybe i'm just not thinking straight..any ideas??