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rB - promień okręgu o środku B
rC - promień okręgu o środku C
rA + rC = 17cm
rC + rB = 15 cm
rA + rB = 16 cm
rA = 17cm - rC
rB = 15cm - rC
17cm - rC + 15 cm - rC = 16cm (podstawiamy tu za rA i rB)
-2rC + 32cm = 16 cm
-2rC = -16cm |:(-2)
rC = 8cm
rA = 17 cm - rC
rA = 17cm - 8cm
rA = 9cm
rB = 15cm - rC
rB = 15cm - 8cm
rB = 7cm