how can we obtain the areas of the irregular polygans or just any closed curve...??
if we know the perimeter of that shape than do we need to divide it into any kind of simpler shape like triangle

Question

how can we obtain the areas of the irregular polygans  or just any closed curve...?? 
if we know the perimeter of that shape than do we need to divide it into any kind of simpler shape like triangle

phi · Answer

for irregular polygons divide the area into triangles.
for any closed surface I think you need to use calculus

anonymous · Answer

@phi i didn't understand
divide the area into triangles.
this line

phi · Answer

ok, here is one way people do it http://www.mathsisfun.com/geometry/area-irregular-polygons.html

anonymous · Answer

and second line 
for any closed surface I think you need to use calculus