Area (compound figure)

How can we calculate a rectangle’s area? Width (W) Area = length x width = L x W Length (L) 5cm   10cm

How can we calculate a square’s area?   Length (L)   5cm

Work out the area of each figure 2cm 3cm 4cm 3cm

How can we calculate the area of this compound figure?

How to calculate the area of this compound figure?

How to calculate the area of this compound figure?

1) Cut 2) Calculate 3) Add

How to calculate the area of this compound figure? Make the shape whole 2) Calculate area of whole 3) Calculate area of missing part 4) Subtract

Practice: 7m 3m 10m 5m

If we cut a rectangle from the square, what’s the area of blue part? 16cm 9cm 4cm 16 cm

What’s the area of shaded part? 5 ← 5 → ← 8 →

What’s the area of this figure? 7 10 3

What’s the area of this figure? 4 2 10

Challenge: If we add 4m to the length of a rectangle, then its area will increase by 20m2 If we subtract 2m from the width of the rectangle, then its area will decrease by 12m2 What is the original area of the rectangle?

Challenge: If we add 4m to the length of a rectangle, then its area will increase by 20m2   4m   2m If we subtract 2m from the width of the rectangle, then its area will decrease by 12m2

Thank you!