I'd stick to using Heron's rule -- there is no reason why it
shouldn't work given correct inputs, and it is less expensive
computationally.
Without doing the maths, I suspect that eliminating the sin/cos from the two
formulas will probably produce Heron's formula in any case.
Danny
I'd stick to using Heron's rule -- there is no reason why
it shouldn't
work given correct inputs, and it is less expensive computationally.
Yeah, but then by switching, I'd be insulting the other Mathematician
dude who invented divide by 4 equation, just for the sake of pleasing
Heron. I
To dodge your question, couldn't you just use the simple distance
forumula to determine the base even when it's not horizontal? I dont'
know much about your application or if you'll have the points where
the triangle's points lie, but that's just an idea.
Oh, but I just thought of something
I recind half of what I said after actually thinking about it, but
maybe it's a different perspective ;)
On 12/14/06, Jordan Snyder [EMAIL PROTECTED] wrote:
To dodge your question, couldn't you just use the simple distance
forumula to determine the base even when it's not horizontal? I dont'
I'm trying to figure the area of a triangle in Actionscript
using the perimeter values only, not the traditional simple formula:
area = (height/2)*base
Try: area = 1/2 * a * b * sin(C), where C is the angle between the two sides
a and b. You can calculate C using the cosine rule: c^2
]
[mailto:[EMAIL PROTECTED] On Behalf
Of Jordan Snyder
Sent: Thursday, December 14, 2006 11:27 AM
To: Flashcoders mailing list
Subject: Re: [Flashcoders] Area of a triangle using perimiter
values only
To dodge your question, couldn't you just use the simple
distance forumula to determine the base even
ALL RIGHT
I'm a silly billy. I used your code and it works just fine. Maybe
the problem isn't in this function.
I'm using Flash 8/AS2.
Cheers
On 12/14/06, Jordan Snyder [EMAIL PROTECTED] wrote:
I recind half of what I said after actually thinking about it, but
maybe it's a different
] Area of a triangle using perimiter
values
only
I recind half of what I said after actually thinking about it, but
maybe it's a different perspective ;)
On 12/14/06, Jordan Snyder [EMAIL PROTECTED] wrote:
To dodge your question, couldn't you just use the simple distance
forumula
Hi Jason
If the number is coming out negative the most likely reason is that
the numbers you are supplying do not make a triangle. (e.g. two sides
are length 1 each and the third is 2 or more). I've tested your code
and it does produce positive numbers for all valid triangles I've
tried.
Jake
Negative result of ((a+b+c)*(b+c-a)*(c+a-b)*(a+b-c)) is not possible if a,b,
and c are lengths of a triangle's sides. The first term will always be
obviously positive, and so will the other three terms -- they are simply
the sum of the lengths of two sides less the third side, and you can't
I'd stick to using Heron's rule -- there is no reason why it shouldn't work
given correct inputs, and it is less expensive computationally.
On 12/14/06, Danny Kodicek [EMAIL PROTECTED] wrote:
I'm trying to figure the area of a triangle in Actionscript
using the perimeter values only, not the
Hello Jason,
public function getTriangleArea (a:Number, b:Number, c:Number):Number {
var p:Number = (a+b+c)/2;
return Math.sqrt(p*(p-a)*(p-b)*(p-c));
}
--
Ivan Dembicki
__
[EMAIL PROTECTED] | http://www.artlebedev.ru |
Jason,
It must be true that your inputs are incorrect, BUT to answer your
question about distributive methods - I was just thinking about
condensing that formula. If you did that(and they do it in the next
step on the MathWorld link) then you have to multiply every term in
parens by every other
Heron's formula looks pretty simple:
function triangleArea(a:Number, b:Number, c:Number):Number {
// Check that all arguments are positive and finite.
if (!(a 0) || !(b 0) || !(c 0) || !isFinite(a) ||
!isFinite(b) || !isFinite(c)) {
throw new Error(Invalid argument(s) for
Thanks - all, yes Jake saw it first and others chimed in with the same
thought, my numbers did not compute because they did not make a
triangle. I have it working now.
The formula is fine, and this function works for me as long as the
values come from a true triangle:
public static
To: Flashcoders mailing list
Subject: RE: [Flashcoders] Area of a triangle using perimiter values only
Thanks - all, yes Jake saw it first and others chimed in with the same
thought, my numbers did not compute because they did not make a triangle. I
have it working now.
The formula is fine
: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Merrill,
Jason
Sent: 14 décembre 2006 14:06
To: Flashcoders mailing list
Subject: RE: [Flashcoders] Area of a triangle using perimiter values only
Thanks - all, yes Jake saw it first and others chimed in with the same
thought, my numbers did
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