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r = 7cm
AB = 10cm
PL =???
PL = √AB² - (R-r)²
PL = √10² - (8-7)²
PL = √100 - 1²
PL = √100 - 1
PL = √99
PL = 9,949
jadi panjang garis perekutuan luar kedua linglaran tersebut adalah 9,949cm