eroshea
please take a look at the diagram..



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eroshea
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dw:1350876483166:dw
how many diagonals can be drawn from vertex A?

ganeshie8
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how many total vertices do u see

eroshea
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8 vertices


eroshea
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ok.. thanks!

ganeshie8
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yw

hartnn
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i don't think that formula would work, because i think dw:1350819998459:dw

hartnn
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i could only find 3 by inspection:
dw:1350820055424:dw

eroshea
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owh.. so that means outside diagonals are not considered as one of the diagonals of a polygon?

hartnn
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yes, that is correct if the line goes outside the polygon, its not considered as diagonal

eroshea
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thanks! :)

ganeshie8
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never heard of it

ganeshie8
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since u said, i take it as correct @hartnn :)