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gd =√j²- (R+r)²
gd= Garis persekutuan dalam
j= Jaraknya
R= jari-jari besar
r= jari jari kecil
ket: d = garis persekutuan dalam
p =jarak kedua pusat
r1 = jari jari terkecil
r2 = jari jari terbesar
semoga membantu^^