[tex] L \: ABCD \times L \:BCGF = 80 \times 40 \\ p \times l \times l \times t = 80 \times 40 \\ p \times 8 \times 8 \times t = 3.200 \\ p \times t \times 64 = 3.200 \\ p \times t = \frac{3.200}{64} \\ p \times t = 50 \\ \\ Luas \: permukaan \: balok \\ 2(p \times l + p \times t + l \times t) \\ 2(80 + 40 + 50) \\ 2(170) \\ 340 \: {cm}^{2} \: (A)[/tex]
Verified answer
[tex] L \: ABCD \times L \:BCGF = 80 \times 40 \\ p \times l \times l \times t = 80 \times 40 \\ p \times 8 \times 8 \times t = 3.200 \\ p \times t \times 64 = 3.200 \\ p \times t = \frac{3.200}{64} \\ p \times t = 50 \\ \\ Luas \: permukaan \: balok \\ 2(p \times l + p \times t + l \times t) \\ 2(80 + 40 + 50) \\ 2(170) \\ 340 \: {cm}^{2} \: (A)[/tex]
Jawaban:
A. 340 cm2
Penjelasan dengan langkah-langkah:
cari panjang dari 80 : 8 = 10
p= 10 cm
cari tinggi dari 40 : 8 = 5
t=5
l= 8
L1= 80x2=160
L2=40x2=80
L3=10x5x2=100
Luas total = 160 + 80 + 100
= 340 cm2