[tex]a = s = k \div 4 = 40 \div 4 = 10 \\ tt = \sqrt{( \frac{1}{2} {a)}^{2} + {t}^{2} } = \sqrt{( \frac{1}{2} .10) {}^{2} + {12}^{2} } \\ \sqrt{ {5}^{2} + {12}^{2} } = \sqrt{25 + 144} = \sqrt{169} = 13 \\ \\ luas \: permukaan \: limas \: persegi \\ s \times s + (2 \times a \times tt) \\ 10 \times 10 + (2 \times 10 \times 13) \\ 100 + 260 \\ 360 \: {cm}^{2} [/tex]
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[tex]a = s = k \div 4 = 40 \div 4 = 10 \\ tt = \sqrt{( \frac{1}{2} {a)}^{2} + {t}^{2} } = \sqrt{( \frac{1}{2} .10) {}^{2} + {12}^{2} } \\ \sqrt{ {5}^{2} + {12}^{2} } = \sqrt{25 + 144} = \sqrt{169} = 13 \\ \\ luas \: permukaan \: limas \: persegi \\ s \times s + (2 \times a \times tt) \\ 10 \times 10 + (2 \times 10 \times 13) \\ 100 + 260 \\ 360 \: {cm}^{2} [/tex]