A 3 by 4 rectangle is inscribed in circle. What is the circumference of the circle?
A. 1π
B. 2π
C. 5π
D. 7π
E. 10π
The diagonal of a rectangle is the diameter of a circle. The diagonal is the hypotenuse of a 3,4,5 triangle, and is therefore, 5.
Circumference = π.diameter = 5π