Question

The Volume "v" of a cone equals 1/3 times the product of (pie) 3.14, the square of the radius "r" of the base, and the height "h".
Find the volume of a cone if r is 10cm and h is 30 cm.
Please help...

Answer 1

\[v=\frac{ 1 }{ 3 } \Pi r ^{2} \]

Answer 2

so just substitute the radius and the height and then simplify =)

Answer 3

do yu know what to do?

Answer 4

Im so sorry but i dont. Like what do i do with the height how do i substitute the the radius and height?

Answer 5

sure i can help :D

v= volume, r= radius, h= height. they give you the radius and height and tell you to find the volume.

v=13Πr2h
v=13Π(10)squared (30)

Answer 6

mistake! its 1/3 not 13

Answer 7

\[v=\frac{ 1 }{ 3 }\Pi r ^{2} h\]
\[v=\frac{ 1 }{ 3 }\Pi (10) ^{2}(30)\]

Answer 8

i substituted.

Answer 9

do you think you can simplify?

Answer 10

yeah but then i start to think how tricky algebra gets then im not sure again

Answer 11

v=3140

Answer 12

am i right?

Answer 13

ok...
\[v=\frac{ 1 }{ 3 }\Pi10^{2}(30)\]
\[v=\frac{ 1 }{ 3 }\Pi 100 (30)\]
\[v=1.047\times100(30)\]
\[v=1.047\times3000\]
\[v=3141\]

Answer 14

Ok thank you so much. I really appreciate it.

Answer 15

sure :D