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emily9102
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Jusaquikie
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so here is what we have:dw:1351376665576:dw

Jusaquikie
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what we want to do is make a triangle out of that and use the Pythagorean theorem (\[A^{2} +B^{2} = C^{2}\])

emily9102
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ok, writing as you type :)

Jusaquikie
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dw:1351376894963:dw

Jusaquikie
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so A(5+10) B(4+3) is \[15^{2}+8^{2}= 225+64= \sqrt{289} = 17\]

Jusaquikie
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that gives the diameter which is 2r so the radius is 8.5

Jusaquikie
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wait it's 7 not 8 lol

emily9102
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7.5 or just 7?

Jusaquikie
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so that changes it to 225+49 =274

Jusaquikie
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the square root of that is 16.55 divided by 2 is 8.276

emily9102
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so 8.3?

Jusaquikie
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do you see where the numbers come from?

emily9102
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yes i was just checking. trying to write fast lol

Jusaquikie
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it would have been neater if i didn't use 8 on the clean example lol

emily9102
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lol yes lots of scratch now haha. so just to be sure its 8.3?

Jusaquikie
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yes that is what it rounds to