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gsl² = 17²-(12-4)²
gsl² = 289-64
gsl² = 225
gsl = √225
gsl = 15 cm
R = 12 cm
r = 4 cm
P = 17 cm
maka :
GL² = P² - (R-r)²
GL² = 17² - (12-4)²
GL² = 289 - 64
GL = √225
GL = 15 CM
jadi panjang grs singgung persekutuan luar = 15 cm