Answer:
1) 40ft^2
2)320mm^2
3) 96m^2
Step-by-step explanation:
first one
find the area of the bigger rectangle (80)
find the area of the inner rectangle (40)
subtract the bigger one from the smaller one(80-40=40)
shaded area is 40ft^2
second one
find the area as if it were a rectangle(720 cm)
find the area of the inner(400cm)
subtract the bigger from the smaller(720-400=320)
answer: 320mm^2
third
find area of the big square(196)
find area of one tiny unshaded square(25)
since all are the same 25x4 is 100
196-100=96
answer;96m^2
