[tex]t =tinggi \: alas \\ \sqrt{ {m}^{2} - ( { \frac{a}{2} )}^{2} } = \sqrt{ {26}^{2} - ( { \frac{20}{2}) }^{2} } \\ \sqrt{ {26}^{2} - {10}^{2} } = \sqrt{676 - 100} \\ \sqrt{576} = 24 \\ \\ Luas \: permukaan \: prisma \:∆ \\ (a \times t) + (a + m + m) \times tp) \\ (20 \times 24) + (20 + 26 + 26) \times 30) \\ 480 + (72 \times 30) \\ 480 + 2.160 \\ 2.640 \: {cm}^{2} [/tex]
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[tex]t =tinggi \: alas \\ \sqrt{ {m}^{2} - ( { \frac{a}{2} )}^{2} } = \sqrt{ {26}^{2} - ( { \frac{20}{2}) }^{2} } \\ \sqrt{ {26}^{2} - {10}^{2} } = \sqrt{676 - 100} \\ \sqrt{576} = 24 \\ \\ Luas \: permukaan \: prisma \:∆ \\ (a \times t) + (a + m + m) \times tp) \\ (20 \times 24) + (20 + 26 + 26) \times 30) \\ 480 + (72 \times 30) \\ 480 + 2.160 \\ 2.640 \: {cm}^{2} [/tex]