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= √13² - (8-3)²
= √169 - 25
= √144
= 12 cm
R = 8 cm
r = 3 cm
P = 13 cm
dit : GL ?
Maka :
GL² = P² - (R-r)²
GL² = 13² - (8-3)²
GL² = 169 - 25
GL = √144
GL = 12 cm
jadi panjang grs singgung persekutuan luar = 12 cm