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15² = 25² - (13 + r2)²
225 = 625 - (13 + r2)²
(13 + r2)² = 625 - 225
(13 + r2)² = 400
(13 + r2)² = 20²
(13 + r2) = 20
13 + r2 = 20
r2 = 20 - 13
r2 = 7cm
Jari Jarinya 7cm