Answer:
we have two trapeziums . find the area of trapezium which goes by ½(a+b)c c is the height. in this case the height of trapezium A = 7+1=8 a =4 b=1 then the calculation is ½×(4+1)8 =20
area or trapezium B= ½×(7+1)5=20 area of the big rectangle L by Width. 8×5=40