you can also get rid of both squares

x² = r²-y²

now increment y2=y+1

x2² = r²-(y+1)²

x2² = r²-y² - 2y - 1

x2² = x² - 2y -1

I'm too tired to get rid of the sqrt too now :)

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery FootballPerl is like chess, only without the dice

In reply to Re^3: circular area in a coordinates grid (AoA) by LanX
in thread circular area in a coordinates grid (AoA) by Discipulus

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