Luas daerah yang diarsir
[tex] \frac{d}{2} ( \frac{3}{7} \times d + a∆) \\ \\ \frac{28}{2} ( \frac{3}{7} \times 28 + 8) \\ \\ 14(20) \\ \\ 280 \: {cm}^{2} \: (d)[/tex]
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Luas daerah yang diarsir
[tex] \frac{d}{2} ( \frac{3}{7} \times d + a∆) \\ \\ \frac{28}{2} ( \frac{3}{7} \times 28 + 8) \\ \\ 14(20) \\ \\ 280 \: {cm}^{2} \: (d)[/tex]