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AC² = 164
AC = √164
Obw abc = 10 ⁺ 8 ⁺ √164
Obw adc = 18 + √164cm
k = 5/10 = ½
Obw a'b'c' = ½ × 18 ⁺ √164
Obw a'b'c' = 9 + √164cm