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.
