please help im stuck on maths and need help quick i cant work out formuls for regular polygons with set length of 1000m and need the overall formula
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- 11-07-2003 11:55
- 11-07-2003 12:01
what do you need to find out from using the formula, e.g. area etc., and at what level is this, e.g. GCSE, AS, A2 ETC.
- 11-07-2003 12:04
i am gcse student and i need formula to work out area
- 11-07-2003 12:15
Is this what you want
Area of triangle = ½ base length x height. ??????
- 11-07-2003 12:34
if this is coursework, then you'll get more marks by showing how you worked out your formula, rather than just making it appear out of nowhere.
for example, for a pentagon, try splitting it up into 5 isosceles triangles and work out the area on one of those triangles. then do the same with hexagons, heptagons and so on... you'll see a pattern begin to emerge, and from that you can get a formula.
by 'set length 1000m' do you mean perimeter or side length? if it's perimeter then you'll need to divide 1000 by the number of sides to get the side length, and you can use that to work out the area of the little triangles using A = 1/2*base*height.
my gcse maths coursework is long gone so i don't know what the general formula is but if you're still stuck i'll try to find it out for you.
meanwhile, try the triangle method and see how it goes!
- 11-07-2003 12:45
ok i've got it.
it's a similar situation to your problem (perimeter = 1000m), and it has all the working out. but if you just want the formula, it's...
A = -----------------
... where n is the number of sides
i think you'd better check to see if it works first.
- 11-07-2003 12:46
oops, that formula didn't come out very well! so here it is again:
A = (500)^2 / n.tan(pi/n)
sorry about that!
- 11-07-2003 12:52
If not, you could always go to e.g. essaybank, or one of the other essay/coursework pages, to see what other people have done, but I'd say only use their answers to get an idea, don't just copy it out, as you'll probably get caught, and in trouble for cheating.