21. A rectangular sheet of plastic is 40 cm by 25 cm. From it 50 circular badges, each of
diameter 4.2 cm, have been cut out. Find the area of the remaining
sheet.
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Area of sheet =40×25 cm² =1000 cm²
Area of button =3.14×1×1 cm²=3.14 cm²
Area of 224 buttons =224×3.14cm ²
=703.36cm²
Area of sheet left out =(1000−703.36)cm ²
=296.64cm²
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