Bonjour,
1)
CD + DE+EF +FA+AB
3+5+8+(5-3) +(8-3)
=16+ 2+5
=> 23 m
2)
AF = 2
FE = 8
CB=3
CD= 3
( 2*8) + ( 3*3)
= 16 +9
=> 25m²
