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MATHS HELP!

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How would I find the volume of this? Got me really confused might seem easy to you but I didn't really listen to the instructions. Read More
Met-Cast Avatar
8y, 3m agoPosted 8 years, 3 months ago
How would I find the volume of this? Got me really confused might seem easy to you but I didn't really listen to the instructions.
Met-Cast Avatar
8y, 3m agoPosted 8 years, 3 months ago
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#1
http://i27.photobucket.com/albums/c192/mazioni/help.jpg
1 Like #2
work out the volume of the largest one, then the inner 'hole', then take it away?
#3
3x8?...
#4
area of outer circle times 8 minus area of inner circle times 8
#5
sancho1983
work out the volume of the largest one, then the inner 'hole', then take it away?


can't believe i didn't think of that :?.

Outside Diameter Pi * 3squared * 8 = 226.19
Inside Diameter Pi * 1.5squared * 8 = 56.55 (should be 56.54 but rounds up?)
169.64 (this should be 169.65

And the answers right thanks alot stuck for hours repped :thumbsup:
#6
dontdothatagain
3x8?...


First thing I tried wouldn't make sense becuase the volume would too big because you wouldn't be counting the big hole through the middle.
#7
nibb211
area of outer circle times 8 minus area of inner circle times 8


Not good with areas so I use the Pi & radius method?
#8
Volume of whole cylinder is 226.285 cubic metres, volume of hole is 56.571 cubic metres, so yr answer is 169.714. Go here
#9
i resat gcse maths a few years ago, so here goes...

first of all you need to find the radius which is half the length of the diameter, so the radius would be 3.

then using the pythagorus button (PI), or entering 3.14 so...

pi x r x r x h or 3.14 x 3 x 3 x 8 = 226.08 cm3 then possibly divide that by 2 and that should give you the answer of:

113.04cm3

hope this is right for you...
1 Like #10
pi * 3/2 squared etc gives you the area i was just being lazy when i wrote it sorry lol
banned#11
find a loo roll and measure, then fill with water, then muliply it by the difference of this measurement and the loo roll
#12
kingy58
Volume of whole cylinder is 226.285 cubic metres, volume of hole is 56.571 cubic metres, so yr answer is 169.714. Go here


That seems to be wrong go here http://www.handymath.com/cgi-bin/tube2.cgi.
Knew the answer just wanted the method don't like cheating.
The answer btw is 169.65

texfitz
i resat gcse maths a few years ago, so here goes...

first of all you need to find the radius which is half the length of the diameter, so the radius would be 3.

then using the pythagorus button (PI), or entering 3.14 so...

pi x r x r x h or 3.14 x 3 x 3 x 8 = 226.08 cm3 then possibly divide that by 2 and that should give you the answer of:

113.04cm3

hope this is right for you...


That gives me the volume if the hole wasn't there I see where your getting at though thanks :)

nibb211
pi * 3/2 squared etc gives you the area i was just being lazy when i wrote it sorry lol


Ah finally I understand thanks :) and no worries.
#13
aye sorry, kingy is right
#14
pi x radius squared gives vol without hole then subtract

pi times (3/2)squared and multiply by8 to give ans
#15
Seems kingy got it wrong the correct answer is 169.65.
#16
kt21
pi x radius squared gives vol without hole then subtract

pi times (3/2)squared and multiply by8 to give ans


Exactly what got me the answer :)
#17
yay!!

Got the old brain cells working again.
#18
Lol, thanks everyone for the attempts appreciate it soo much :), off to do the next bit shouldn't be going on addictive HUKD :oops:
banned#19
Met-Cast
Lol, thanks everyone for the attempts appreciate it soo much :), off to do the next bit shouldn't be going on addictive HUKD :oops:


your welcome :thumbsup:
#20
LOL the toilet roll idea :p still made me laugh thanks.

Got another one :oops: what do I do with the 2 diameters which are on two sides of a cuboid?
#21
Think your right there.

Not diameters just width and length.
#22
Good God..if were talking about Maths at this time and Quidco isnt involved then I'm bringing the AK47 out....:w00t:
#23
Jumpingphil
OK, I'm outta here. Goodnight. :thumbsup:


lol...have a good one dude :thumbsup:
#24
Goodnight mate :thumbsup:.
Sorry being lazy heres a pic.
http://i27.photobucket.com/albums/c192/mazioni/help2.jpg
#25
I worked out the hole but was confused on the whole thing thought you had to still use Pi.
Goodnight thanks mate :thumbsup:

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