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12² = 13² - (7 - r)²
(7 - r)² = 169 - 144
(7 - r)² = 5²
7 - r = 5
r = 2 cm
12² = 13² - (7 - r2)²
144 = 169 - (7 - r2)²
169 – 144 = (7 - r2)²
25 = (7- r2)²
25 = (7-2)²
Jari jari yg lain adalah 2 cm.
D.