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s² = p²-l²
= 25²-20²
= 625-400
= 225
s = √225 = 15 cm
ket :
l = garis singgung persekutuan luar
p = jarak titik pusat
s = selisih dua jari jari
20² = 25² - (R - r)²
400 = 625 - (R - r)²
√225 = R - r
15 = R - r => Selisih = 15