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anonymous

  • 4 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.

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  1. Mertsj
    • 4 years ago
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    \[SA=4\pi r^2\]

  2. Mertsj
    • 4 years ago
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    Plug 2 into that in place of r. When you get the answer, divide it by 2 since we're talking about half a jawbreaker.

  3. anonymous
    • 4 years ago
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    it is 16 pi. you divide with 2 it becomes8 pi.is it right

  4. Mertsj
    • 4 years ago
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    That's what I got.

  5. anonymous
    • 4 years ago
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    but the answer is12 pi

  6. Mertsj
    • 4 years ago
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    We forgot to add the flat surface which is a circle with radius 2

  7. anonymous
    • 4 years ago
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    please can you explain

  8. Mertsj
    • 4 years ago
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    The area of that circle is pi(2)^2 or 4 pi

  9. Mertsj
    • 4 years ago
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    |dw:1328826025121:dw|

  10. Mertsj
    • 4 years ago
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    The 8 pi is the area of the shaded part. The flat part where it was cut in two is part of the surface too.

  11. Mertsj
    • 4 years ago
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    Do you understand?

  12. anonymous
    • 4 years ago
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    what answer did you get it?

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