anonymous
  • anonymous
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.
Mathematics
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anonymous
  • anonymous
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.
Mathematics
katieb
  • katieb
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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anonymous
  • anonymous
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anonymous
  • anonymous
i am getting 8 pi .is it right
anonymous
  • anonymous
i think it should be 48pi

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anonymous
  • anonymous
oh hell, no.... i thought radius was 4, not diameter... sec
anonymous
  • anonymous
answer is 12 pi.I don't know how
anonymous
  • anonymous
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.
anonymous
  • anonymous
i am getting 8 pi
anonymous
  • anonymous
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
anonymous
  • anonymous
ugh, radius 2
anonymous
  • anonymous
so its 12pi
anonymous
  • anonymous
please can you explain
anonymous
  • anonymous
Ahhh yes I forgot about the inside cut. I assumed a hollow sphere. :O stupid mee
Xishem
  • Xishem
It's the surface area of half a sphere plus the surface area of the circle... \[\frac{4πr^2}{2}+\pi r^2=2 \pi r^2+\pi r ^2=3 \pi r^2= 3 \pi (2cm)^2=12 \pi\ cm\]
Xishem
  • Xishem
*\[12\pi\ cm^2\]
anonymous
  • anonymous
Thanks

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