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D² = 25² - 15²
D² = 625 - 225
D² = 400
D = 20 cm
R = 10
r = 5
P = 25
maka :
D² = P² - (R+r)²
D² = 25² - (10+5)²
D² = 625 - 225
D = √400
D = 20 cm
jadi panjang garis singgung persekutuan dalam = 20 cm