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3x-4y+1 = 0 = Ax+By+C ==============a to nasza prosta K
S(a,b)
Obliczmy odległość S od prostej K
d = |A*a+B*b+C|/√A²+B² = |3*112-4*85+1|/√25 = 3/5
d<r
3/5<5 ===============>czyli mają 2 punkty wspólne