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Mathematics 8 Online
OpenStudy (anonymous):

what happens to the surface area of a sphere as its sides double?

OpenStudy (anonymous):

LLAMAZ

OpenStudy (kainui):

Let's look at the formulas for volume and surface area. Plug one into the other and wherever you see area, just put in 2*area and that will tell you.

OpenStudy (gorv):

loll say radius ...its radius will change

OpenStudy (gorv):

how much find that out by following what kainui said

OpenStudy (anonymous):

So I would plug in the area formula into the volume formula and vise versa?

OpenStudy (gorv):

surface area= 4pi(r1)^2 new after doubling =4*pi*(r2)^2

OpenStudy (gorv):

but new area = 2*old area 4*pi*(r2)^2=2*4*Pi*(r)^2 r2)^2=2*(r1)^2 r2=(2*r1^2)^1/2 r2=(sqrt2)*r1 that is the new radius

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