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24² = 26² - (7+r)²
576 = 676 - (7+r)²
(7+r)² = 676 - 576
7+r = √100
7+r = 10
r = 10 - 7
r = 3 cm
24,26,10←
12,13,5
persekutuan dalam jari2nya ditambah ya..
R+r=10←
7+r=10
r=10-7
r=3