![= \: 2(hl + lb + bh) - 6a {}^{2} \\ = \: 2[(3)(12)+(12)(3)+(3)(3)] - 6(3) {}^{2} \\ = 2(36+36+9) - 6(9) \\ = 162 - 54 \\ = 108\:cm²](/tpl/images/2518/9104/ca2d6.png)
Can anybody answer the second Q please?
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