A square beam and a circular beam have the same length, same allowable stress and the same bending moment. The ratio of weights of the square beam to the circular beam is

A square beam and a circular beam have the same length, same allowable

1.	A square beam and a circular beam have the same length, same allowable stress and the same bending moment. The ratio of weights of the square beam to the circular beam is
A.	1/2
B.	1
C.	1/1.12
D.	1/
E.	<span class="root">2</span>
Answer» D. 1/