There are test standards to determine poisson ratio. For aluminum, it is 0.33
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The answer depends on the ratio of the shape to what!
The answer depends on what ratio of the triangle you are interested in.
multiply by 2
If the ratio of the radii is 1:3 then the ratio of volumes is 1:27.
The answer depends on what the ratio is relative to!The ratio of a circumference to the area of a circle is half the radius.