Respuesta :

D(-2,5)
C(-2,-3)
E(8,5)
F(8,-3)
A(2,5)
B(8,1)
C(-2,-3)

AD= 4 units
DC= 8 units
AE = 6 units
EB = 4 units
BF = 4 units
CF = 10 units

ADC = 16 sq units
AEB = 12 sq units
BFC = 20 sq units

90 -16 -12 -20 = 42 sq units

Hope this is the right answer ☺