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d² = s² - ( r1 + r2)²
d² = 25² - ( 9 + 6 )²
d² = 625 - 15²
d² = 625 - 225
d = √400
d = 20 cm
panjang garis singgung persekutuan luar
l² = s² - (r1 - r2)²
l² = 25² - (9 - 6)²
l² = 625 - 3²
l² = 625 - 9
l = √616
l = 24,82 cm