halo kk², mohon bantuannya lagi.... Question from @qwertygfdsazxcvm

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halo kk², mohon bantuannya lagi

$a = \sqrt{ {c}^{2} - {b}^{2} } = \sqrt{ {10}^{2} - {8}^{2} } \\ \sqrt{100 - 64} = \sqrt{36} = 6 \\ s = 2 \times 6 = 12 \\ \\ lp \: limas \: persegi \\ 2s( \frac{1}{2} s + tt) \\ 2.12( \frac{1}{2} .12 + 10) \\ 24(6 + 10) \\ 24(16) \\ 384 \: {cm}^{2}$