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R = 16 cm
r = 7 cm
P = 15 cm
dit GL ?
maka :
GL² = P² - (R-r)²
GL² = 15² - (16-7)²
GL² = 225 - 81
GL = √144
GL = 12 cm
jadi panjang garis singgung persekutuan luar = 12 cm