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r = 6 cm
p = 17 cm
Ditanya : d ?
Penyelesaian :
d² = p² - (R + r)²
d² = (17)² - (9 + 6)²
d² = (17)² - (15)²
d² = 289 - 225
d² = 64
d = √64 = 8 cm