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Monica [59]
3 years ago
11

C=2πr solve for r what is the answer for this question and how do you do it

Mathematics
2 answers:
Ymorist [56]3 years ago
8 0
You said                               C           = 2 π r

Divide each side by  2 :      C / 2      =    π r

Divide each side by pi :       C / 2π  =       r
Zinaida [17]3 years ago
4 0
Just divide 2pie on both sides so your equation would be C/2pie=r
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Natasha_Volkova [10]

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The volume of the solid is 243\sqrt{2} \ \pi

Step-by-step explanation:

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0  ≤ ρ   ≤  9

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V  = \int \limits^{\pi/2}_{\pi/4} \ sin \phi  \ d \phi  \int \limits ^{2\pi}_{0} d \theta \int \limits^9_0 \rho   ^2 d\rho

V = \bigg [-cos \phi  \bigg]^{\pi/2}_{\pi/4}  \bigg [\theta  \bigg]^{2 \pi}_{0} \bigg [\dfrac{\rho^3}{3}  \bigg ]^{9}_{0}

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V = 243\sqrt{2} \ \pi

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