tinggi balok itu adalah

p × l × t = v
[tex](18 + 2 \sqrt{3} ) \times (5 - 2 \sqrt{3} ) \times t = 312[/tex]
[tex]18(5 - 2 \sqrt{3} ) \times + 2 \sqrt{3} (5 - 2 \sqrt{3} ) \times t = 312[/tex]
[tex]90 - 36 \sqrt{3} + 10 \sqrt{3} - 12 \times t = 312[/tex]
[tex](78 - 26 \sqrt{3} )t = 312[/tex]
[tex]t = \frac{312}{(78 - 26 \sqrt{3} )} [/tex]
[tex]t = \frac{312}{(78 - 26 \sqrt{3} )} \times \frac{(78 + 26 \sqrt{3}) }{(78 + 26 \sqrt{3} )} = \frac{24.336 + 8.112 \sqrt{3} }{6.084 - 2.028} = 6 + 2 \sqrt{3} [/tex]