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t = 15
l = 7500 : (25 x 15)
= 7500 : 375
= 20
maka luas permukaan
= 2 (pl +pt+lt)
= 2 ((25 x 15) + (25 x 20) + (15 x 20))
= 2 (375 + 500 + 300)
= 2 (1175)
= 2.350 cm²