2007-06-19 16:15:29 · 7 answers · asked by beautifulsnap 2 in Science & Mathematics ➔ Mathematics
4*pi*r^2 is the surface area of a SPHERE, not of a HOLLOW SPHERE
TSA of a HOLLOW SPHERE= INNER S.A. + OUTER S.A.
2007-06-19 16:28:05 · update #1
A trick to remember the Surface Area is to take the derivative of the sphere volume formula:
The volume of a sphere is 4/3 πr³.
The derivative of 4/3 πr³ is 4/3 * 3πr² =
4πr² as the surface area.
2007-06-19 16:27:58 · answer #1 · answered by MathGuy 6 · 2⤊ 5⤋
Tsa Of A Sphere
2016-11-12 05:50:22 · answer #2 · answered by Anonymous · 0⤊ 0⤋
It doesn't matter if it is a hollow or solid sphere, the surface area will always be A = 4*Pi*r^2
Hope this helps.
2007-06-19 16:27:55 · answer #3 · answered by Lee 3 · 0⤊ 1⤋
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I have two answers as well, but fortunately they come out equal. Let r denote the radius of the sphere (that's 8mm. as the diameter is 16mm). The surface area of the sphere is 4pi r^2. Let h be the height of the cylinder. (a) If the cylinder is hollow, then its total surface area is 2pi rh inside plus 2pi rh outside = 4pi rh. Therefore: 4pi rh = 4pi r^2 h = r = 8mm. Answer (A). (b) If the cylinder is solid, then its total surface area is (the curved surface plus the two ends): 2pi rh + 2pi r^2 = 2pi r(h + r). Therefore: 2r^2 = r(h + r) = r^2 + rh r^2 = rh h = r = 8mm. Answer (A).
2016-04-05 00:31:36 · answer #4 · answered by ? 4 · 0⤊ 0⤋
SA=4*pi*r^2
2007-06-19 16:18:24 · answer #5 · answered by fcas80 7 · 0⤊ 1⤋
4 pi * r^2 on each side. r is the radius
2007-06-19 16:24:11 · answer #6 · answered by cattbarf 7 · 0⤊ 1⤋
im sure it depends on the size of the sphere
2007-06-19 16:24:31 · answer #7 · answered by Anonymous · 1⤊ 1⤋