Comments on: Which Ice Cream Cone Should She Choose? http://www.exampaper.com.sg/questions/e-maths/which-ice-cream-cone-should-she-choose Sassy O Level Maths Tuition, Questions & Tips from Singapore's Favourite Private Tutor Sun, 05 Feb 2012 17:08:39 +0000 hourly 1 By: Anoneemers http://www.exampaper.com.sg/questions/e-maths/which-ice-cream-cone-should-she-choose#comment-15161 Anoneemers Sat, 25 Oct 2008 09:58:00 +0000 http://www.exampaper.com.sg/questions/e-maths/which-ice-cream-cone-should-she-choose#comment-15161 [pmath]Actually its quite easy to determine which cone is bigger...they have the same radius (3/4r)mm but cone A has height of (1/2h)mm while cone B has height of (3/4h)mm-since B similar to larger cone since (3/4) > (1/2), B is larger than A. [/pmath] Actually its quite easy to determine which cone is bigger...they have the same radius (3/4r)mm but cone A has height of (1/2h)mm while cone B has height of (3/4h)mm-since B similar to larger cone
since (3/4) > (1/2), B is larger than A.

]]> By: kiroii http://www.exampaper.com.sg/questions/e-maths/which-ice-cream-cone-should-she-choose#comment-983 kiroii Sat, 15 Sep 2007 07:22:17 +0000 http://www.exampaper.com.sg/questions/e-maths/which-ice-cream-cone-should-she-choose#comment-983 true cant refute that..one can hardly assert himself true cant refute that..one can hardly assert himself

]]> By: Miss Loi http://www.exampaper.com.sg/questions/e-maths/which-ice-cream-cone-should-she-choose#comment-962 Miss Loi Thu, 13 Sep 2007 15:05:01 +0000 http://www.exampaper.com.sg/questions/e-maths/which-ice-cream-cone-should-she-choose#comment-962 Umm ... please see correction. Your working's fine but you really need to cut down on your careless mistakes. Anyway consumer rights are an urban legend in Singapore :) Umm ... please see correction. Your working's fine but you really need to cut down on your careless mistakes.

Anyway consumer rights are an urban legend in Singapore :)

]]> By: kiroii http://www.exampaper.com.sg/questions/e-maths/which-ice-cream-cone-should-she-choose#comment-961 kiroii Thu, 13 Sep 2007 14:13:56 +0000 http://www.exampaper.com.sg/questions/e-maths/which-ice-cream-cone-should-she-choose#comment-961 and volume of cone b be L k/r = 3/4 (given) (3/4)^3 = L/320 L =<del>136</del> <span class="highlight">135</span> (never-de-less still having disparity furthermore his context of admission that both cones are equal should be more then enough to call CASE against unscrupulous businessmen..) and volume of cone b be L

k/r = 3/4 (given)

(3/4)^3 = L/320

L =136 135 (never-de-less still having disparity furthermore his context of admission that both cones are equal should be more then enough to call CASE against unscrupulous businessmen..)

]]> By: Miss Loi http://www.exampaper.com.sg/questions/e-maths/which-ice-cream-cone-should-she-choose#comment-960 Miss Loi Thu, 13 Sep 2007 13:58:32 +0000 http://www.exampaper.com.sg/questions/e-maths/which-ice-cream-cone-should-she-choose#comment-960 Yes it is vital to remember that for two <em>similar</em> figures <var>X</var> and <var>Y</var>, For volume, you <em>cube</em> the dimensional ratio: <m>V_x/V_y = (r_x/r_y)^3</m> For area, you <em>square</em> the dimensional ratio: <m>A_x/A_y = (r_x/r_y)^2</m> So can you find the volume of Cone <var>B</var> now? Yes it is vital to remember that for two similar figures X and Y,

For volume, you cube the dimensional ratio: V_x/V_y = (r_x/r_y)^3

For area, you square the dimensional ratio: A_x/A_y = (r_x/r_y)^2

So can you find the volume of Cone B now?

]]> By: kiroii http://www.exampaper.com.sg/questions/e-maths/which-ice-cream-cone-should-she-choose#comment-955 kiroii Thu, 13 Sep 2007 05:05:54 +0000 http://www.exampaper.com.sg/questions/e-maths/which-ice-cream-cone-should-she-choose#comment-955 OH NOW I SEE LOL! i shouldnt have square it should have cubed it LOL! kk got iit got it..sry sry carelessness OH NOW I SEE LOL! i shouldnt have square it should have cubed it LOL! kk got iit got it..sry sry carelessness

]]> By: kiroii http://www.exampaper.com.sg/questions/e-maths/which-ice-cream-cone-should-she-choose#comment-954 kiroii Thu, 13 Sep 2007 05:05:00 +0000 http://www.exampaper.com.sg/questions/e-maths/which-ice-cream-cone-should-she-choose#comment-954 huh?>.< i dun get what u mean by opening my text book and refering to the formula for similar figures..got formula *meh? if memory serves it's jus ratio? huh?>.< i dun get what u mean by opening my text book and refering to the formula for similar figures..got formula *meh? if memory serves it's jus ratio?

]]> By: Miss Loi http://www.exampaper.com.sg/questions/e-maths/which-ice-cream-cone-should-she-choose#comment-941 Miss Loi Wed, 12 Sep 2007 15:49:07 +0000 http://www.exampaper.com.sg/questions/e-maths/which-ice-cream-cone-should-she-choose#comment-941 Kiroii, cheers to you for getting the volume of Cone <var>A</var> correctly (As usual, please see comments in <span class="highlight">red</span>). For Cone <var>B</var>, before you start calling CASE, please quickly open your textbook and refer to the formula for <em>similar figures</em>. Look under the one that deals with the <em>volumes</em> of two similar figures. Kiroii, cheers to you for getting the volume of Cone A correctly (As usual, please see comments in red).

For Cone B, before you start calling CASE, please quickly open your textbook and refer to the formula for similar figures. Look under the one that deals with the volumes of two similar figures.

]]> By: kiroii http://www.exampaper.com.sg/questions/e-maths/which-ice-cream-cone-should-she-choose#comment-938 kiroii Wed, 12 Sep 2007 10:19:39 +0000 http://www.exampaper.com.sg/questions/e-maths/which-ice-cream-cone-should-she-choose#comment-938 CONE A CONE A!~(tho i feel b is larger in substance but de bigger it is de bigger de toothache is too>.>) for the largecone <m>{1/3} * pi * r^2 * h =320</m> <var>π</var><var>r</var><sup>2</sup><var>h</var> = 960 (volume is fixed as per se) volume for cone A: <m>{1/3} * ({3/4} r)^2 * {h/2}</m> <span class="highlight">Don't miss out the <var>π</var> in your working!</span> volume =<m>{1/3} * (9/16)r^2 * {h/2}</m> <span class="highlight"> x <var>π</var></span> volume = <m>{9/96} * pi * r^2 * h = {9/96} * 960</m> ( ∵ <var>πr</var><sup>2</sup><var>h</var> = 960) volume = 90 for cone a..90mm<sup class="highlight">3</sup>? cone B on de otherhand..let r of cone b be k and volume of cone b be L k/r = 3/4 (given) (3/4)^2 = L/320 L = 180 (An incredulous 90mm discrapancy..time to call CASE and start sueing?) CONE A CONE A!~(tho i feel b is larger in substance but de bigger it is de bigger de toothache is too>.>)

for the largecone {1/3} * pi * r^2 * h =320

πr2h = 960 (volume is fixed as per se)

volume for cone A: {1/3} * ({3/4} r)^2 * {h/2} Don't miss out the π in your working!
volume ={1/3} * (9/16)r^2 * {h/2} x π
volume = {9/96} * pi * r^2 * h = {9/96} * 960 ( ∵ πr2h = 960)
volume = 90 for cone a..90mm3?

cone B on de otherhand..let r of cone b be k
and volume of cone b be L

k/r = 3/4 (given)

(3/4)^2 = L/320

L = 180 (An incredulous 90mm discrapancy..time to call CASE and start sueing?)

]]> By: Miss Loi http://www.exampaper.com.sg/questions/e-maths/which-ice-cream-cone-should-she-choose#comment-928 Miss Loi Tue, 11 Sep 2007 16:36:58 +0000 http://www.exampaper.com.sg/questions/e-maths/which-ice-cream-cone-should-she-choose#comment-928 Hehe guess this is 职业病…. What to do? Hehe guess this is 职业病…. What to do?

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