## janessia Group Title 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 one year ago one year ago

1. janessia Group Title

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

2. jim_thompson5910 Group Title

Area of the base = ???

3. phi Group Title

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

4. janessia Group Title

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

5. janessia Group Title

@jim_thompson5910 am i right?

6. jim_thompson5910 Group Title

yes

7. jim_thompson5910 Group Title

now multiply that with the height

8. janessia Group Title

2260.8

9. jim_thompson5910 Group Title

then divide by 3

10. janessia Group Title

i still got 753.6!

11. janessia Group Title

thats wrong!

12. jim_thompson5910 Group Title

ok which matches to which answer

13. jim_thompson5910 Group Title

i know, each answer has a pi in it

14. jim_thompson5910 Group Title

one of those answers is roughly equal to 753.6

15. janessia Group Title

720

16. janessia Group Title

?

17. jim_thompson5910 Group Title

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

18. janessia Group Title

k

19. janessia Group Title

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

20. phi Group Title

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

21. janessia Group Title

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

22. janessia Group Title

but ohk yes i got 36

23. phi Group Title

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

24. janessia Group Title

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

25. janessia Group Title

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

26. phi Group Title

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.

27. phi Group Title

Yes to b. 80 cu. ft

28. janessia Group Title

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

29. janessia Group Title

thanks :)