Lebar balok
[tex] \frac{(LP \div 2) - (p \times t)}{(p + t)} \\ \\ \frac{(900 \div 2) - (12 \times 10)}{(12 + 10)} \\ \\ \frac{(450 - 120)}{22} \\ \\ \frac{330}{22} \\ \\ 15 \: cm[/tex]
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Lebar balok
[tex] \frac{(LP \div 2) - (p \times t)}{(p + t)} \\ \\ \frac{(900 \div 2) - (12 \times 10)}{(12 + 10)} \\ \\ \frac{(450 - 120)}{22} \\ \\ \frac{330}{22} \\ \\ 15 \: cm[/tex]