Зделайте номера 5,6,7 зарание спасибо

5) [latex]S = S_{1} - S_{2} \\ S_{1} = ab = 4 * 8 = 32 \\ S_{2} =  \pi r^2 =  3 * 4 = 12 \\ S = 32 - 12 = 20[/latex] 6) [latex]S = S_{1} - \frac{S_{2}}{2} \\ \\ S_{1} = ab = 4 * 8 = 32 \\ S_{2} = \pi r^2 = \pi * 1 = \pi = 3 \\ \\ S = 32 - 3 = 29 [/latex] 7) [latex]S = \frac{1}{2}S_{1} \\ S_{1} = ab = 4 * 8 = 32 \\ \\ S = \frac{32}{2} = 16 [/latex]