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anonymous

  • 5 years ago

Can someone help me? If a sphere has a diameter of 26 units then what is the surface area of the sphere? A.) 507 π square units B.)1,352 π square units C.)2,929 π square units D.) 676 π sqaure units

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  1. anonymous
    • 5 years ago
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    \[A = 4 \pi r^2 = 4 \pi 13^2 = 676 \pi\]

  2. anonymous
    • 5 years ago
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    You just posted this.. Don't repost.

  3. anonymous
    • 5 years ago
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    Did you find the surface area equation?

  4. anonymous
    • 5 years ago
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    @ muh4ha thanks so much :)

  5. anonymous
    • 5 years ago
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    no problem katie - but you rly should try and understand it, so you can do it on your own. Did you get, why I plugged in 13 ?

  6. anonymous
    • 5 years ago
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    ni can you explain?

  7. anonymous
    • 5 years ago
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    Because the 'r' in the Formula is the 'radius' of the sphere - that's the distance from the center to the surface. You are given the diameter - that's twice as much (same as when looking at a circle).. So another way of writing the formula would be: \[A = 4 \pi ({d \over 2})^2\] okay? Did you get it? Any other questions?

  8. anonymous
    • 5 years ago
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    oh wow thanks so much :)

  9. anonymous
    • 5 years ago
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    you're welcome :) best thing to do, would be to try another example completely on your own and see if you can get it ;)

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