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=/13^2 - 5^2
=/169 - 25
=/144 = 12 cm
garis singgung persekutuan luar lingkaran
p² = j² - (r1-r2)²
p² = 13² - (8-3)²
p² = 169 - 5²
p² = 169 - 25
p² = 144
p = √144
p = 12
maka garis singgungnya = 12