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R = r1 - r2
= 9 - 4
= 5
jarak antar puat lingkaran = 9 + 4 = 13
garis singgung = √(13²-5²) = 12
l = √13² - 5²
= √169 - 25
= √144
= 12
jadi, panjang grs singgung prsktuan luarnya 12 cm