Hi guys which formula suit this Question?
thanks
Hello, User Name!
I'll number the formulas like this: .
Formula (1): .
. . is the area of the circle. . is the average of the two radii.
Therefore, (1) gives the area of the "average circle".
. . I seriously doubt that this happens to be the volume of the doughnut.
Formula (3): .
. . is the volume of a sphere.
. . We have: .
This is the volume of a sphere of radius
. . plus the volume of a sphere of radius
. . divided by 4.
This is too large to be the volume of the doughnut.
Formula (4): .
We have: .
. . is the area of the outer circle.
. . is the area of the inner circle.
. . is the area of the "ring".
I don't think multiplying by will give us the volume of the dougnut.
Formula (5): .
We have: .
This the volume of a sphere of radius ... (quite large!)
. . multipled by
This is far too large to be the volume of the doughtnut.
By elimination, . .is the volume of the doughnut.