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= p X l X t
= (2a+3) X 4a X (2a+2)
= (20a² + 6) cm²
mungkinnnn.......
p = 2a + 3
l = 4a
t = 2a + 2
Luas Permukaan Balok
2 pl + 2 pt + 2 lt
= 2 (pl + pt + lt)
= 2 [((2a + 3) * 4a) + ((2a + 3) * (2a+2)) + (4a * (2a + 2))]
= 2 [(8a² + 12a) + (4a² + 10a + 6) + (4a² + 8a)]
= 2 (8a² + 4a² + 4a² + 12a + 10a + 8a + 6)
= 2 (16a² + 30a + 6)
= 32a² + 60a + 12
kecilkan
= 16a² + 30a + 12