[tex]a).h = \sqrt{ {a}^{2} + {t}^{2} } = \sqrt{ {9}^{2} + {12}^{2} } \\ \sqrt{81 + 144} = \sqrt{225} = 15 \: cm \\ \\ b).lp \: prisma \: segitiga \\ (a \times t) + (a + t + m) \times tp) \\ (9 \times 12) + (9 + 12 + 15) \times 35) \\ 108 + (36 \times 35) \\ 108 + 1.260 \\ 1.368 \: {cm}^{2} [/tex]
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[tex]a).h = \sqrt{ {a}^{2} + {t}^{2} } = \sqrt{ {9}^{2} + {12}^{2} } \\ \sqrt{81 + 144} = \sqrt{225} = 15 \: cm \\ \\ b).lp \: prisma \: segitiga \\ (a \times t) + (a + t + m) \times tp) \\ (9 \times 12) + (9 + 12 + 15) \times 35) \\ 108 + (36 \times 35) \\ 108 + 1.260 \\ 1.368 \: {cm}^{2} [/tex]