HSC Stuff > HSC Mathematics Extension 2

4U Help pls!

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KT Nyunt:
Hello,
I have some volumes questions here: If anyone could help me that'd be great!!

For the ellipse one ... I got 12 pi squared

For other one (btw our teacher told us that it is supposed to be a square into the equilateral triangle GEF) ... I really don't know - could someone show me the working pls?

Thanks in advance :)

RuiAce:
\(12\pi^2\) looks correct for the first one.

The diagram really isn't sufficient enough for the other one. Please post the entire question; I can't tell what angle \(\frac\pi3 \) is supposed to describe.

KT Nyunt:

--- Quote from: RuiAce on May 23, 2018, 08:16:46 pm ---\(12\pi^2\) looks correct for the first one.

The diagram really isn't sufficient enough for the other one. Please post the entire question; I can't tell what angle \(\frac\pi3 \) is supposed to describe.

--- End quote ---

Rip that is the entire question. I believe \(\frac\pi3 \) is supposed to be the base angles of the trapezium (not the cross section but the base of the solid)

RuiAce:
If those side lengths are actually 10 and 1 those are the ugliest values I have seen all my LIFE in MX2. The method should be fine but I am honestly hoping that there's been a minor computation error somewhere (or just a printing error) as this is absolutely sickening and time-wasting. I know for one I would not want to even expand those brackets, let alone compute an integral with those ugly coefficients everywhere.

KT Nyunt:

--- Quote from: RuiAce on May 23, 2018, 09:56:35 pm ---If those side lengths are actually 10 and 1 those are the ugliest values I have seen all my LIFE in MX2. The method should be fine but I am honestly hoping that there's been a minor computation error somewhere (or just a printing error) as this is absolutely sickening and time-wasting. I know for one I would not want to even expand those brackets, let alone compute an integral with those ugly coefficients everywhere.

--- End quote ---

Bahahaha yep you pretty much summarised how I felt about this question. Unfortunately those lengths ARE actually 10 and 1 and I don't think this is a printing error because it happened to be in my teacher's hsc.  :'(
But this is really helpful! Thank you very much :)

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