Square M is inscribed in circle N. If the perimeter of M is 20, what is the circumference of N?	Pick one.
A) 33√ 2π
B) 2√ 2π
C) 6√ 2π
D) 7√ 2π
E) 5√ 2π
square forms two right angled triangles.   Any time we have a right angle triangle inside a circle, the hypotenuse is the diameter.   hypotenuse here = diagonal of the square = 5 sqrt(2) = diameter   =&gt; radius = 2.5 sqrt(2)   Circumference of the circle = 2pi r = 5 pi sqrt(2)   Answer is 5√ 2π.
<result>E</result>
Square M is inscribed in circle N. If the perimeter of M is 20, what is the circumference of N?