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x =
=
=
=
=
= 15 cm
L = garis singgung persekutuan luar
P = garis AB
r2 = garis AK
r1 = garis BL
Lpangkat 2 = Ppangkat 2 - (r2 - r1)pangkat 2
Lpangkat 2 = 17pangkat 2 - (13 - 5)pangkat 2
Lpangkat 2 = 289 - 8pangkat 2
Lpangkat 2 = 289 - 64
Lpangkat 2 = 225
L = akar 225
L = 15