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= 2 ( 45cm × 1,5cm + 45cm × 20cm + 1,5cm × 20cm )
= 2 ( 67,5 + 900 + 30)
= 2 × 997,5
= 1995
l = 20 cm
t = 1,5 cm
Luas Permukaan Balok
= 2 x ( pl + pt + lt )
= 2 x ( (45 . 20) + (45 . 1,5) + (20 . 1,5)
= 2 x ( 900 + 67,5 + 30 )
= 2 x 997,5
=