Find the surface area of a shpere whose radius is 7 millimeter.
mm the Formula is SA = 4 pi r^2h
what if they dont give me the height??
2007-07-14 14:14:37 · 8 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
The S.A of a sphere = 4(pi)r^2
there is no height involved.
S.A = 4(3.14)(49)
S.A = 615.44 mm^2
2007-07-14 14:18:15 · answer #1 · answered by Anonymous · 1⤊ 0⤋
The bypass area of a sphere is actual a circle. So the formula for the area of a circle is A = pi * r^2. The formula for floor area (SA) of a sphere is SA = 4 * pi * r^2 in case you comprehend that pi * r^2 = 19, then replace that into the SA formula to get your answer. SA = 4 * 19 SA = 76
2016-12-10 12:22:08 · answer #2 · answered by ? 4 · 0⤊ 0⤋
actually the formula is 4pi r square.....follow that.. The height that your talking about in this case would be the diameter which is twice the radius of the sphere. If they gave u the height well halve the height and that would be ur radius and then all u have to do is put that number into the formula and work it out.!! Trust me. Im a boss at geometry!
2007-07-14 14:26:50 · answer #3 · answered by diablo_blaze7 2 · 0⤊ 1⤋
4 times area of circle
4 pi r^2
2007-07-14 14:36:46 · answer #4 · answered by CPUcate 6 · 0⤊ 0⤋
SA = 4 π r²
= 4 x π x 49 mm²
= 615.8 mm²
2007-07-16 07:01:04 · answer #5 · answered by Como 7 · 0⤊ 0⤋
Jith has the right answer. The formula you have appears to be for a volume, since the ...(r^2)(h) part would yield a value of mm^3 .
2007-07-14 14:21:09 · answer #6 · answered by Optimizer 3 · 0⤊ 0⤋
The height is also the diameter which is 2r or in this case 14 mm.
2007-07-14 14:18:21 · answer #7 · answered by Lady Geologist 7 · 0⤊ 0⤋
4*pi*r^2=4*22\7*7*7=616mm^2
616mm^2 \100=6.16cm^2
2007-07-14 14:38:21 · answer #8 · answered by Anonymous · 0⤊ 0⤋