geometry help

Question

geometry help

Gucchi · Answer

attachment

Gucchi · Answer

@vocaloid can you give some steps on how to do this

Vocaloid · Answer

there are some mistakes in the points you've plotted. (-5,3) and (-3,3) are in quadrant II.

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this will make a rectangle, which, as you've demonstrated in previous problem, will make a cylinder when rotated about the x-axis.

Vocaloid · Answer

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should be straightforward to calculate the appropriate lengths from here

Gucchi · Answer

wait so would the height be 2 and diameter 3?

Vocaloid · Answer

notice how the x-axis goes along the diameter of the cylinder.

consider one of the circles as the base of the cylinder. I'll use the right one as an example. the center of the circle is (-3,0). the circle's radius extends from (-3,0) to (-3,3) which has a distance of 3 points. (3 - 0 = 3). double that to get the diameter, 6.

the height is 2 as you have correctly stated (5-3=2).

Gucchi · Answer

@vocaloid wrote:

there are some mistakes in the points you've plotted. (-5,3) and (-3,3) are in quadrant II. Created with Raphaël(-5,3)(-3,3)(-5,0)(-3,0)Reply Using Drawing this will make a rectangle, which, as you've demonstrated in previous problem, will make a cylinder when rotated about the x-axis.

im so dumb lol i didnt see this

Vocaloid · Answer

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Gucchi · Answer

@vocaloid wrote:

notice how the x-axis goes along the diameter of the cylinder. consider one of the circles as the base of the cylinder. I'll use the right one as an example. the center of the circle is (-3,0). the circle's radius extends from (-3,0) to (-3,3) which has a distance of 3 points. (3 - 0 = 3). double that to get the diameter, 6. the height is 2 as you have correctly stated (5-3=2).

okay i understand this

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