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November 01, 2025, 10:05:42 am
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Author Topic: VCAA 2007 - Geometry  (Read 681 times)  Share 

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geoff_821

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VCAA 2007 - Geometry
« on: November 06, 2011, 01:52:06 pm »
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Question 4b in geometry.

So in question 4a. I worked out that 3/4 of the height of the pyramid has been removed, therefore 1/4 of the height is remaining.

In question 4b. it asks what fractionb of the volume of the pyramid is remaining.
Since there is 1/4 remaining, I did (1/4)^3. However in the answers, they did (1 - (3/4)^3).
Why can't I use my method and why aren't the answers the same?
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some dude

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Re: VCAA 2007 - Geometry
« Reply #1 on: November 06, 2011, 03:02:11 pm »
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umm because the shape remaining is not similar to the pyramid?
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geoff_821

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Re: VCAA 2007 - Geometry
« Reply #2 on: November 06, 2011, 03:09:57 pm »
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Quote from: some dude on November 06, 2011, 03:02:11 pm
umm because the shape remaining is not similar to the pyramid?

oh wow. Why didn't I think of that. thankyou!!
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