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Pyramid question

Victor · 2006-10-14 12:11:04

Can you solve the attached question? State what level you are at (higher, lower, year). Don't feel bad if you can't. Apparently its a difficult question.

14-10-2006 12:11pm

#1

Victor

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Can you solve the attached question? State what level you are at (higher, lower, year).

Don't feel bad if you can't. Apparently its a difficult question.

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#2 14-10-2006 1:36pm

Feral Mutant

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Gottit. First year in college.
8*route13 or 28.844102
Why is this on the CTYI forum?

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#3 14-10-2006 1:57pm

mathias

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This is very basic ,

Area of a triangle = 1/2 base x perpendicular height ,

You already know the base is 4 , to get the height you use pythagoras for the right angle triangle in the centre ,

Square of the hypotenuse = sum of squares on other two sides , so thats

2 squared = 4 plus 3 squared = 9 = 13 , so hypotenuse = root 13 , this is the height of the triangle for a side.

Area of one side = 2 x root 13 , so 4 sides = 8 x root 13

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#4 14-10-2006 5:37pm

PurpleFistMixer

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Strange. I did it a slightly different way, I think. (I take this from the fact that your answer doesn't involve any roots of 17, and mine did.. : p)

But yes, same answer, so must have worked out alright.

And why shouldn't it be on the CTYI forum? : p It's not like the forum has any SPECIFIC purpose.

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#5 21-10-2006 12:03am

Victor

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I've put the answer here: http://www.boards.ie/vbulletin/showpost.php?p=52221922&postcount=15

PFM, stop stalking me.

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#6 21-10-2006 12:18am

PurpleFistMixer

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... No. I like pyramids.

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#7 21-10-2006 12:40am

Victor

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Fairy nuff.

Same question.

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#8 21-10-2006 12:17pm

Feral Mutant

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Not enough information given. There's no way to determine the inclination of the side of length 3.

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#9 21-10-2006 9:50pm

Garret

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8 * route 13

1st year college, i remember doin that question last year

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#10 22-10-2006 6:18pm

Victor

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Feral Mutant wrote:

Not enough information given. There's no way to determine the inclination of the side of length 3.

Apologies. For a Feral Mutant you are very correct. Amended drawing attached.

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#11 22-10-2006 7:12pm

PurpleFistMixer

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Alright, I got 62.25 but it's highly likely I made a calculatory mistake along the way. I think my theory is alright, though I didn't use the 1 at all.

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#12 22-10-2006 7:22pm

Feral Mutant

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Victor wrote:

Apologies. For a Feral Mutant you are very correct. Amended drawing attached.

That's right. Everyone praise Daniel.
I got 8*route13 again.

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#13 22-10-2006 8:38pm

Victor

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Feral Mutant wrote:

That's right. Everyone praise Daniel.
I got 8*route13 again.

Oddly enough, yes. I should really work these out before posing them.

PFM: wrong! :shock:

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#14 22-10-2006 9:22pm

Victor

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Next one. Lets move on slightly.

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#15 23-10-2006 3:44pm

PurpleFistMixer

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Victor, where are you getting these from?

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#16 24-10-2006 4:45pm

Victor

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Oh, I'm just inventing them as I go along.

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