Second moment of area about an axis along any diameter in the plane of the cross section (i.e. x-x, y-y) is each equal to (1/4)pi r^4.
The second moment of area about the zz-axis (along the axis of the cylinder) is the sum of the two, namely (1/2)pi r^4.
The derivation is by integration of the following:
int int y^2 dA
over the area of the cross section, and can be found in any book on mechanics of materials.
Yes, because you can multiply $3 by 3 to get $9 and 6 muffins by 3 to get 9 muffins.
I can only guess that you meant to write
12 + 3 = 3 + 12
which would be the commutative property of addition.
Answer:
Multiplication of Alzebra
method has been used by Natalie
I believe the answer would be 8