dvilla

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These are questions asked by dvilla

I am trying to rotate a region about the y-axis. However, entering axis=vertical rotates it about the z-axis. I have also tried interchanging the x and y values. However, it produces the same output. The left image is what I'd like to rotate about the y-axis. The code below is for the right image. How would I revolve this region about the y-axis? Please help.

VolumeOfRevolution(2*x^2 + 1, x = 0 .. 1, labels = [x, y, z], output = plot, axis = vertical, orientation = [270, 0, 90])

How do you apply colors to an entire solid of revolution? I can't seem to color the bases of a disk. Please help.

Here is what I have. I would like the entire solid to be the same color,transparency,etc.

v := VolumeOfRevolution(4, x = 1 .. 2, volumeoptions = [color = blue, transparency = 0.6], orientation = [270, 0, 15], view = [0 .. 3, -5 .. 5, -5 .. 5], labels = [x, y, z], output = plot, axis = horizontal, scaling = constrained)

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