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R = 8 cm
r = 3 cm
P = 13 cm
jadi :
GL² = P² - (R-r)²
GL² = 13² - (8-3)²
GL² = 169 - 25
GL = √144
GL = 12 CM
Jadi pnjng grs singgung persekutuan luar = 12 cm
PG² = 13² - ( 8-3 )²
PG² = 169 - 5²
PG² = 169 - 25
PG² = 144
PG = √144
PG = 12
jadi, Panjang garis singgung persekutuan luar AB = 12 cm