[tex]tt = \sqrt{ {c}^{2} - ( { \frac{a - b}{2} )}^{2} } \\ \sqrt{ {10}^{2} - ( { \frac{15 - 3}{2}) }^{2} } = \sqrt{ {10}^{2} - {6}^{2} } \\ \sqrt{100 - 36} = \sqrt{64} = 8 \\ \\ LP \: prisma \: trapesium \\ (a + b)(tt + tp) + (2 \times c \times tp) \\ (15 + 3)(8 + 25) + (2 \times 10 \times 25) \\ 18(33) + 500 \\ 594 + 500 \\ 1.094 \: {cm}^{2} \: (C)[/tex]
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[tex]tt = \sqrt{ {c}^{2} - ( { \frac{a - b}{2} )}^{2} } \\ \sqrt{ {10}^{2} - ( { \frac{15 - 3}{2}) }^{2} } = \sqrt{ {10}^{2} - {6}^{2} } \\ \sqrt{100 - 36} = \sqrt{64} = 8 \\ \\ LP \: prisma \: trapesium \\ (a + b)(tt + tp) + (2 \times c \times tp) \\ (15 + 3)(8 + 25) + (2 \times 10 \times 25) \\ 18(33) + 500 \\ 594 + 500 \\ 1.094 \: {cm}^{2} \: (C)[/tex]