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AVprozaik [17]
3 years ago
6

A right cylinder has radius 9 cm and height 12 cm. If the radius and height are tripled, what happens to the surface area? A. Th

e surface area is multiplied by 9. B. The surface area is multiplied by 6. C.The surface area is multiplied by 1/3. D. The surface area is tripled.
Mathematics
2 answers:
nlexa [21]3 years ago
7 0
Cylinder surface area (original) =2pir^2+2pirh
if height is trippled and radius is tripple then

new area=2pi(3r^2)+2pi(3r)(3h)
new area=2pi9r^2+2pirh9
new area=9(2pir^2)+9(2pirh)
new area=9(2pir^2+2pirh)
remember that 2pir^2+2pirh=original area
new are=9(original area)

therefor the surface area is multiplied by 9
victus00 [196]3 years ago
3 0
The formula for surface area is 
A= 2\pi rh + 2<span>\pi r</span>x^{2}
The cylinder not trippled 
SA = 1187.52
Trippled 
SA= 10687.7 
 so the answer is A. multiplied by 9
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