a)
P1= 1 *(2+1) = 1*3 = 3 m ^2
P2 = 1 * (4 + 1) = 1 * 5 = 5 m ^2
P= 3 + 5 = 8m ^2
b)
P1 i P2 = 1 * 2 = 2 m ^2
P3 = 5 *1 = 5 m ^2
P4 = 1 * 1 = 1 m ^2
P= 1 + 5+ 2 + 2= 10 m ^2
c)
P1 = 5 * 5 = 25 m ^2
P2 = 3 * 3 = 9 m ^ 2
P= 25 - 9 = 16 m ^ 2
d)
P1, P2 i P3 = 1 * 5 = 5 m ^ 2
P4 i P 5 = 1*1 = 1 m ^2
P = 5 + 5 + 5 + 1 +1 = 17 m ^ 2