Luas trapesium
[tex] \frac{1}{2} \times t(a + b) \\ \\ \frac{1}{2} \times 12(28 + 40) \\ \\ 6(68) \\ \\ 408 \: {cm}^{2} \: (b)[/tex]
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Luas trapesium
[tex] \frac{1}{2} \times t(a + b) \\ \\ \frac{1}{2} \times 12(28 + 40) \\ \\ 6(68) \\ \\ 408 \: {cm}^{2} \: (b)[/tex]