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1790 = 2 (20x17 + 20xt + 17xt)
1790 = 2(340 +20t + 17t)
1790 = 680 + 40t + 34t
1790 - 680 = 74t
1110 = 74t
t = 15
maka tinggi balok tersebut adalah 15 cm
LP = 1790 cm²
l = 17 cm
p = 20 cm
Ditanya:
t?
Jawab:
LP = 2 × ( p × l ) + 2 × ( p × t ) + 2 ( l × t )
1790 = 2 ( 20 × 17 ) + 2 ( 20 × t ) + 2 ( 17 × t )
1790 = 2 ( 340 ) + 2 ( 20t ) + 2 ( 17t )
1790 = 680 + 40t + 34t
1790 - 680 = 74t
1110 = 74t
1110/74 = t
t = 15 cm