tolong bantuanya,,,,,,,
[tex]a = 10 \div 2 = 5 \\ h = \sqrt{ {a}^{2} + {t}^{2}} = \sqrt{ {5}^{2} + {12}^{2} } \\ \sqrt{25 + 144} = \sqrt{169} = 13 \\ \\ lp \: prisma \: segitiga \\ (as \times ts) + ((as + h+ h) \times tp) \\ (10 \times 12) + ((10 + 13 + 13) \times20) \\ 120 + (36 \times 20) \\120 + 720 \\840 \: {cm}^{2} [/tex]
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