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A solid candy jawbreaker is cut in half. If its diameter is 4 cm, what is the surface area of a half piece? please show me the steps.
 2 years ago
 2 years ago
A solid candy jawbreaker is cut in half. If its diameter is 4 cm, what is the surface area of a half piece? please show me the steps.
 2 years ago
 2 years ago

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sammy12Best ResponseYou've already chosen the best response.0
i am getting 8 pi .is it right
 2 years ago

TonikBest ResponseYou've already chosen the best response.1
i think it should be 48pi
 2 years ago

TonikBest ResponseYou've already chosen the best response.1
oh hell, no.... i thought radius was 4, not diameter... sec
 2 years ago

sammy12Best ResponseYou've already chosen the best response.0
answer is 12 pi.I don't know how
 2 years ago

funinaboxBest ResponseYou've already chosen the best response.1
2A = 4pi*r^2 2A = 4pi*(2)^2 2A = 16pi A = 8pi I set it equal to 2A because we want half the surface area, I found the full SA then divided by 2.
 2 years ago

TonikBest ResponseYou've already chosen the best response.1
the surface area on the outside is 8pi, you're correct, but you need to add the surface are where the cut was made (basically the area of a circle radius 4
 2 years ago

funinaboxBest ResponseYou've already chosen the best response.1
Ahhh yes I forgot about the inside cut. I assumed a hollow sphere. :O stupid mee
 2 years ago

XishemBest ResponseYou've already chosen the best response.0
It's the surface area of half a sphere plus the surface area of the circle... \[\frac{4πr^2}{2}+\pi r^2=2 \pi r^2+\pi r ^2=3 \pi r^2= 3 \pi (2cm)^2=12 \pi\ cm\]
 2 years ago
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