Question

Find the volume of a cone with radius 6 m and height 20 m.
Choose one answer.
a. 720π m^3
b. 240π m^3
c. 120π m^3
d. 40π m^3

Answer 1

@jim_thompson5910 i got 753 and i did all the steps but no right answer... help me?

Answer 2

Area of the base = ???

Answer 3

Did you use
\[ V= \frac{1}{3} \pi r^2 h \]

Answer 4

@jim_thompson5910 sorry i had to run some errands for my mom but the area of the base is 113.04

Answer 5

@jim_thompson5910 am i right?

Answer 6

yes

Answer 7

now multiply that with the height

Answer 8

2260.8

Answer 9

then divide by 3

Answer 10

i still got 753.6!

Answer 11

thats wrong!

Answer 12

ok which matches to which answer

Answer 13

i know, each answer has a pi in it

Answer 14

one of those answers is roughly equal to 753.6

Answer 15

720

Answer 16

?

Answer 17

no, try doing the calculations without 3.14 and use pi instead

Answer 18

k

Answer 19

i really dont know i did and i got 753.98223687 this time

Answer 20

when you find the area
using
\[ \pi r^2\]
leave pi in. do not use 3.14
you get
\[ 36 \pi\]

Answer 21

i dont have my graphing calc right now so im using a scientific one right now

Answer 22

but ohk yes i got 36

Answer 23

V= 1/3 pi r^2 h
if you leave the pi to one side:
\[ \pi (\frac{1}{3} 36 \cdot h )\]
just figure out the stuff in the parens

Answer 24

i got 240 woowww how'd yo do that... how was i getting 753?

Answer 25

I got B for this is that right?
Find the volume of a square pyramid with base edges 4 ft. and height 15 ft.
Choose one answer.
a. 20 cu. ft
b. 80 cu. ft
c. 240 cu. ft
d. 60 cu. ft

Answer 26

the answer is
\[ 240 \cdot \pi \]
240 times pi
if you replace pi with 3.14159... you get 753. with lots of decimals

people just write it 240 pi and if someone wants the exact number, they can multiply it out themselves.

Answer 27

Yes to b. 80 cu. ft

Answer 28

oh ohk thanks a lot can you check my answer above?

Answer 29

thanks :)