LP balok dan limas
[tex]2 \times p( \frac{1}{2} \times p + 2 \times tb + tl) \\ \\ 2 \times 18( \frac{1}{2} \times 18 + 2 \times 22 + 15) \\ \\ 36(9 + 44 + 15) \\ \\ 36(68) \\ \\ 2.448 \: {cm}^{2} [/tex]
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LP balok dan limas
[tex]2 \times p( \frac{1}{2} \times p + 2 \times tb + tl) \\ \\ 2 \times 18( \frac{1}{2} \times 18 + 2 \times 22 + 15) \\ \\ 36(9 + 44 + 15) \\ \\ 36(68) \\ \\ 2.448 \: {cm}^{2} [/tex]