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AB'2 = MN'2 - (R-r)'2
dalam 2 lingkaran
AB'2 = MN'2 - (R-r)'2
GSPL ( garis singgung persekutuan luar)
GSPL² = P ² - ( r1 - r2)
GSPD
GSPD ² = P ² - ( r1 + r 2)