The surface area of a spherical balloon is 175 cm2. If the length of the radius was six times as large, what would the surface area be?

Question

cornzyblack · Answer

Since the Surface area was 175 cm^2 , we use the foemula to calculate for the radius(making r subject of formula)

Surface area of sphere  = 4 * pi * r^2
So r = Sqrt(Surface area of sphere / pi )
So r = 7.463 

if the radius was 6 times as large then, 
new radius R = r * 6 =  44.778

Using Surface area formula = 4 * pi * R ^2
New Surface area is , 25,196.44 cm^2

ganeshie8 · Answer

@CornzyBlack  method works always.. just he forgot about "4"..

you should get a surface area : 
175 x 6^2 = 6300 sq.cm

anonymous · Answer

Well the answer choices are:
1050cm^2
6300cm^2
8400cm^2
11200cm^2

anonymous · Answer

Oh, ok thanks you guys!

ganeshie8 · Answer

yw..