Bonsoir,
AB = √144 => 12m
BC =√400 =>20m
aire EACF
12² + 20² = 144 + 400 = 644
Aire EACF = 644m²
Aire triangle:
(12*20)/2 => 120m²
aire totale
120 + 144 + 400+ 644 =>1 308m²