20² = ab² - (9 + 6)²
20² = ab² - 15²
400 = ab² - 225
ab² = 400 + 225
ab = √625
ab = 25 cm
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20² = ab² - (9 + 6)²
20² = ab² - 15²
400 = ab² - 225
ab² = 400 + 225
ab = √625
ab = 25 cm