Bonsoir,

* Area of the rectangle ABCD = L x l

= 3,5 x 1,5

= 5,25

-> The area of ABCD is 5,25 cm².

* Area of the triangle EFG = b x h

= ( 3,5 - ( 1 + 0,5 ) ) x 1,5

= ( 3,5 - 1,5 ) x 1,5

= 2 x 1,5

= 3

-> The area of EFG is 3 cm²

* Area of the grey surface = Area of ABCD - Area of EFG

= 5,25 - 3

= 2,25

-> The area of the grey surface is 2,25 cm².

Bonne continuation !

Courage en cette période compliquée.

Lucas.