Question

зделайте номера 5,6,7 зарание спасибо

Answer 1

5)
$S = S_{1} - S_{2} \ S_{1} = ab = 4 * 8 = 32 \ S_{2} =  pi r^2 =  3 * 4 = 12 \ S = 32 - 12 = 20$

6)
$S = S_{1} - frac{S_{2}}{2} \ \ S_{1} = ab = 4 * 8 = 32 \ S_{2} = pi r^2 = pi * 1 = pi = 3 \ \ S = 32 - 3 = 29$
7)
$S = frac{1}{2}S_{1} \ S_{1} = ab = 4 * 8 = 32 \ \ S = frac{32}{2} = 16$