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R = 6 cm
r = 3 cm
P = 15 cm
dit : D ?
dijwb :
D² = P² - (R+r)²
D² = 15² - (6+3)²
D² = 225 - 81
D = √144
D = 12 CM
JADI panjang gariss persekutuan dalam = 12 cm