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Mathematics 8 Online
OpenStudy (anonymous):

@iGreen Same thing as before?

OpenStudy (anonymous):

What is the approximate volume of a cylinder with a diameter of 14 meters and a height of 10 meters? Use 3.14 for pi. A. 219.8 m^3 B. 439.6 m^3 C. 1538.6 m^3 D. 6154.4 m^3

OpenStudy (igreen):

Approximate, so you plug in 3.14 for pi. \(V = \dfrac{1}{3} \pi r^2 h\)

OpenStudy (anonymous):

Confused on this one, due to "diameter" and not Radius

OpenStudy (igreen):

Diameter is double the radius, so divide by 2 to find the radius.

OpenStudy (igreen):

Sorry, I just accidentally closed my window.

OpenStudy (anonymous):

its fine lol. so divide diameter by 2?

OpenStudy (anonymous):

14/2 = 7

OpenStudy (igreen):

Yep

OpenStudy (anonymous):

10 times 3.14 times 7^2(Simplifying after that) 10 times 3.14 times 49

OpenStudy (anonymous):

31.4 times 49

OpenStudy (anonymous):

1538.6?

OpenStudy (anonymous):

C?

OpenStudy (igreen):

Oh..this is a cylinder..not a cone.

OpenStudy (igreen):

So we take out the 1/3.

OpenStudy (igreen):

Yeah, C is correct.

OpenStudy (anonymous):

Thanks.

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