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2014-05-22T11:59:52+07:00
(x,y)
P = (-2,-3)
P'=(5,2)

ΔX=|-2-5|=|-7|=7
ΔY=|-3-2|=|-5|=5
r²=x²+y²
r²=49+25
r²=74
r=√74
2 5 2