niall1Dawesome
Find the surface area for a sphere with a radius of 10 feet. Round to the nearest whole number.
1,256 ft2
4,189 ft2
1,089 ft2
1,568 ft2
Find the volume of a sphere with a radius of 10 feet. Round to the nearest whole number. 1,257 ft3
4,187 ft3
1,089 ft3
1,568 ft3
Find the surface area for a sphere with a radius of 7 cm. Round to the nearest whole number.
307 cm2
1,436 cm2
1,020 cm2
615 cm2
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niall1Dawesome
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@qweqwe123123123123111
SithsAndGiggles
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A = 4πr²
V = 4/3 πr³
niall1Dawesome
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is that too the first question??
niall1Dawesome
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hey my friend says your really smart qwe
qweqwe123123123123111
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They're the answers to all 3 of your questions.
qweqwe123123123123111
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I'm not smart.
I have google. :-)
niall1Dawesome
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1256 is step a for question 1
qweqwe123123123123111
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1256 is the answer to question 1.
niall1Dawesome
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thats what i thought cause i did v and i was all liek wait what!!!
qweqwe123123123123111
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Yes...volume will be somewhat larger... :-)
niall1Dawesome
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i meant 3rd questions answer is 615.44
qweqwe123123123123111
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Yes, 615 is question 3. :-)
niall1Dawesome
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and on volume does he mean 1/3?
ryan123345
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Area of Sphere Formula
qweqwe123123123123111
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No. He means 4/3 (same as 1.33333.....)
v = 4/3 pi r^3
ryan123345
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\[A = \frac{ 4 }{ \pi r^2 }\]
ryan123345
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so for the last one your equation would be.
niall1Dawesome
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is it c?
ryan123345
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\[\frac{ 4 }{ \pi(49) }\]
niall1Dawesome
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3140 sorry i wasnt there
niall1Dawesome
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@tafkas77
tafkas77
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Hi there! You mentioned me; what can I help you with? I'm not sure which question you're looking at. :)
niall1Dawesome
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the middle one
tafkas77
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Are you still trying to figure out the answer to #3?
tafkas77
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.... Hello? @niall1Dawesome You there?
niall1Dawesome
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sorry my computer was lagging really bad
niall1Dawesome
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no number 2 i already know 1 and 3
niall1Dawesome
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@tafkas77
tafkas77
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Okay. I'm taking a look at this right now. :)
tafkas77
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Eureka! I have the answer. :) Do you know the formula to calculate this?
niall1Dawesome
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okay and hey you changed your icon cool
tafkas77
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Ha ha, yeah. :) I felt like switching it up a bit.
So do you know the formula to calculate this?
tafkas77
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Are you still experiencing lag?
niall1Dawesome
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a little
niall1Dawesome
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and well isnt the formula V = 4/3 πr³
tafkas77
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Okay, I think you are still experiencing a little lag. No worries, I can still help you with this. Hopefully when you see it, you'll get it! :) Perfect formula! :)
niall1Dawesome
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ya your post jsut showed up
tafkas77
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So let's plug in the values from your problem:
\[v = 4/3 * \pi * 10^3\]
\[v = 4/3 * \pi * 1,000\]
When you plug this all in (you can do it on a calculator), you'll find that 4/3 = 1.3.
so:
\[v = 1.3 * 3.14 * 1,000\]
And then you'll get your answer. :)
niall1Dawesome
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ok i will do that
niall1Dawesome
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4082
tafkas77
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Sorry; my mistake. You should have rounded 1.3 and input 1.4 (since 1.3333333... is irrational) and you would have gotten 4,187 :)
niall1Dawesome
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oh lol
tafkas77
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XD Hey, everyone makes mistakes... ugh... can't say that without thinking of Hannah Montana...
niall1Dawesome
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hey can you check my answer to a question like this
tafkas77
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yes I sure can! :)
niall1Dawesome
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Find the volume for a sphere with a radius of 7 cm. Round to the nearest whole number.
307 cm2
1,436 cm2
1,020 cm2
615 cm2
im pretty sure its b but im going to redo the math
niall1Dawesome
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hehe hannah montana lol
niall1Dawesome
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yea i think it is b
tafkas77
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You are absolutely correct. :)
niall1Dawesome
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yay lol thx for helping me
tafkas77
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You're welcome! :D
niall1Dawesome
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:) everybody makes mistakes everybody has those days 1 2 3 4 lol i had too