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c(2 , 5)
xa = - 5
xc = 2
ya = - 6
yc = 5
IACI = √[(xc - xa)² + (yc - ya)²] = √[(2 + 5)² + (5 + 6)²] = √(7² + 11²) =
= √(49 + 121) = √170
IACI = a√2 = √170
a - √170 : √2 = √85
r - promień okręgu wpisanego = 1/2a = 1/2 √85
odp B