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40 = 5 x 4 x t
40 = 20 x t
t = 40 : 2
t = 2
Luas = 2x( pxl + pxt +lxt )
= 2 x ( 5x4 + 5x2 + 4x2)
= 2 x (38)
= 76
20 . t = 40
t = 40 : 2 = 2
luas seluruh sisi balok = 2 (5 . 4 + 5 . 2 + 4 . 2)
= 2 (20 + 10 + 8)
= 2 . 38
= 76
b. 10 . l . 3 = 180
30 . l = 180
l = 180 : 30
l = 6
luas seluruk sisi balok = 2 (10 . 6 + 10 . 3 + 3 . 6)
= 2 (60 + 30 + 18)
= 2 . 108
= 216