# The diagram shows a simplified model of a building with four identical heavy floors?

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- WhomeLv 73 months agoFavorite Answer
Let the force carried by the top rods be F

The bottom rods carry a force of 4F

Stress is force per unit area

area is proportional to the square of the diameter A = πD²/4

F/(πd²/4) = 4F / (πD²/4)

πD²/4 = 4πd²/4

D² = 4d²

D = 2d

D/d = 2

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