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April 29, 2024, 01:35:56 pm
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Author Topic: Derive  (Read 1955 times)  Share 

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2happy

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Derive
« on: November 14, 2007, 08:47:04 pm »
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Can anyone derive the formula for a:
Hexagon
Octagon
From scratch?

i think you have to:
- use pythag
- double angle formulas
- anything else
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Ahmad

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Derive
« Reply #1 on: November 14, 2007, 09:02:29 pm »
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What do you mean by formula? What exactly do you want to determine?
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Derive
« Reply #2 on: November 14, 2007, 09:54:45 pm »
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You mean formula for area of those shapes? Or something?
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2happy

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Derive
« Reply #3 on: November 14, 2007, 10:11:24 pm »
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i mean: you start with an octagon and you have to prove that the formula to find the AREA of an octagon is __________(watever it is - dont have formula nxt to me atm)
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Galelleo

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Derive
« Reply #4 on: November 15, 2007, 09:52:16 am »
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using what, vectors?

I find it hard to imagine theres a cartesian formula that creates a perfect octagon... :S
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Ahmad

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Derive
« Reply #5 on: November 15, 2007, 03:24:43 pm »
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Hint: inscribe the regular polygon in a circle, draw radius lines from the center to the vertices. Split up the shape into triangles.
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2happy

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« Reply #6 on: November 15, 2007, 03:41:51 pm »
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thanks ahmad; i had the exam today: the put the octagon in a square and had circles with radius r on the vertices of the octagon (8 in total) then u had to find the area of a leftover bit: pretty hard
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Ahmad

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« Reply #7 on: November 15, 2007, 03:43:25 pm »
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That's the common way for an octagon, but it's not very general. ^^
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