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20² = d² - (9+6)²
400 = d² - (15)²
400 = d² - 225
d² = 400 + 225
d² = 625
d = √625
d = 25 cm
R = 9 cm
r = 6 cm
p = ?
d² = p² - (R + r)²
20² = d² - (9 + 6)²
20² = d² - 15²
400 = d² - 225
d² = 400 + 225
d² = 625
d = √625
d = 25 cm
semoga membantu ya :)