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20^2 =j2-(9+6)2
400 =j2-15^2
400 =j2-225
400+225=j2
625 =j2
√625 =j
25 =j
(9 + 6)² = j² - 20²
15² = j² - 20²
225 = j² - 400
j² = 400 + 225
j² = 625
j = √625
j = 25 cm