Radius of Torus

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March 8, 2013 - 8:07am
#1
Aira Venice's picture
Aira Venice
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Radius of Torus

If the surface area of the torus is 1280 pi squared, find the radius of the torus.

pls help. tnx!.

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March 8, 2013 - 2:29pm
Romel Verterra's picture
Romel Verterra
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Re: Torus

Surface are of torus
$ A = 2\pi r \times 2\pi R $
 

r = radius of the generating circle
R = radius of torus
 

Is the radius of circle given? If it is not then the answer will be in terms of r.
$ 1280\pi = 2\pi r \times 2\pi R $

$ R = \dfrac{320}{\pi r} $
 

Wrong solution (I first though the given is volume):

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March 8, 2013 - 3:39pm
(Reply to #2)
HELLectrical
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Re: Torus

sir yung number 5 po yung tanong ko. pero dapat po sagutan muna yung 4 para masagutan yung number 5.

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March 8, 2013 - 4:12pm
(Reply to #2)
Aira Venice's picture
Aira Venice
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Re: Torus

sir yung r=20 po.

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