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R = 12 cm
r = 5 cm
P = 24 cm
maka :
a. D² = P² - (R+r)²
D² = 24² - (12+5)²
D² = 576 - 289
D = √287
D = 16,94 cm
b. GL² = P² - (R-r)²
GL² = 24² - (12-5)²
GL² = 576 - 49
GL = √527
GL = 22,95 cm