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**unique****Member**- Registered: 2006-10-04
- Posts: 419

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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**luca-deltodesco****Member**- Registered: 2006-05-05
- Posts: 1,470

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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