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d²= p² + l²
17² = 15² + l²
l²= 289 - 225
l²= 64
l =√64
l = 8
luas permukaan balok
= 2 ( p l + p.t + l.t)
= 2 (15 . 8 + 15 . 10 + 8 . 10)
= 2 ( 120 + 150 + 80)
= 2 . 350
= 700