Answer:
68,67 cm^2
Step-by-step explanation:
Let's calculate first the total area of pastry that we have.
Let A be that area.
The pastry has rectangular form so its area is:
● A = width × length
The width here is 16 and the length is 20
● A = 20 × 16
● A = 320 cm^2
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Let's calculate the are of the 20 pastry circles
Let A' be the area of one circle.
● A' = Pi × r^2
r is the radius wich is the diameter over 2.
● d/2 = 4/2 = 2 cm
● A' = Pi × 2^2
● A' = 4Pi cm^2
The area of 20 pastry circles is 20A'
● 20A'= 20 × 4 × Pi
● 20A'= 80Pi
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Let A" be the area of the remaining pastry
● A" = A-20A'
● A" = 320 - 80Pi
● A" = 68.67 cm^2
