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Mathematics 9 Online
OpenStudy (linn99123):

What is the approximate volume of the cone? Use 3.14 for π. A. 1272 cm3 B. 6359 cm3 C. 2120 cm3 D. 4239 cm3 http://static.k12.com/calms_media/media/1299500_1300000/1299583/1/eb8c74d9448e1dd720d2449ad84890705bdfa9b7/143809.jpg i think its D

OpenStudy (mathstudent55):

\(V = \dfrac{\pi r^2 h}{3}\)

OpenStudy (linn99123):

i got 90 o.0

OpenStudy (mathstudent55):

I don't understand what that means.

OpenStudy (linn99123):

90cm

OpenStudy (mathstudent55):

\(V = \dfrac{3.14 \times 15 ~cm \times 15~cm \times 9 ~cm}{3} \) \(V = 3.14 \times 15 ~cm \times 15~cm \times 3 ~cm \)

OpenStudy (mathstudent55):

Do the multiplication on the second line above.

OpenStudy (linn99123):

i got 6358.5 cm

OpenStudy (linn99123):

and i divided nad got 2119.5 cm

OpenStudy (mathstudent55):

Much better. Which answer is that closest to?

OpenStudy (linn99123):

C

OpenStudy (mathstudent55):

You got it!

OpenStudy (linn99123):

TY :D

OpenStudy (mathstudent55):

yw

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