Hey guys, i was wondering if anyone knows the area formula for an octagon, nonagon, decagon etc. I can't seem to find any on google?
i've never heard of any formulae for these shapes,
try breaking them up into groups of smaller shapes you do have the formulae for

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Im not sure how it is supposed to be done, but I would take an octagon for example, and break it up into 8 triangles, find the area of 1 and multiply times 8.
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you could use the formula area = 1/2 apothem x perimeter

apothem = distance from the side of the shape to the middle, its like the radius of a circle but in this case you do it with one side of the polygon to the centre

edit: oh yeah theres also this formula

Area of a regular polygon = (1/2) N x sin(360°/N) x S²

where n = no of sides and s = length from centre to corner of the shape
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Last edited by nikhil101 at Jul 26, 2008,
Yeah, its already been said. For regular polygons, you can brake them up into equal triangles and then find the area. For irregular polygons, you might need some funky tringles.
Quote by nikhil101
you could use the formula area = 1/2 apothem x perimeter

apothem = distance from the side of the shape to the middle, its like the radius of a circle but in this case you do it with one side of the polygon to the centre

edit: oh yeah theres also this formula

Area of a regular polygon = (1/2) N x sin(360°/N) x S²

where n = no of sides and s = length from centre to corner of the shape

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Just divide them into triangles and it becomes easy
you have to decompose the shape in order to get to familiar shapes
Thanks Guys, i'll try these