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- anonymous

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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- anonymous

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- anonymous

\[A = 4 \pi r^2 = 4 \pi 13^2 = 676 \pi\]

- anonymous

You just posted this.. Don't repost.

- anonymous

Did you find the surface area equation?

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- anonymous

@ muh4ha thanks so much :)

- anonymous

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 ?

- anonymous

ni can you explain?

- anonymous

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?

- anonymous

oh wow thanks so much :)

- anonymous

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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