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#1 2006-12-26 10:30:29
- unique
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- Registered: 2006-10-04
- Posts: 419
surface area
find the surface area pf a sphere with a diameter of sqrt2 cm
4 pi r^2
ok i know this
but wht would be the radius and half of sqrt2
Desi
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#2 2006-12-26 10:35:38
- luca-deltodesco
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- Registered: 2006-05-05
- Posts: 1,470
Re: surface area
well supposing thats correct for surface area (tbh i dont know, but using that formula)
diameter is √2, so radius is ½√2
r² = (½√2)² = ½²×√2² = ¼×2 = ½
so the surface area would be 4×π×½ = 2π (π = pi)
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