Rani has a cardboard measuring 90 cm by 80 cm. She cuts out a small rectangular piece measuring 15 cm by 20 cm. a) Find the area of the remaining piece of cardboard. b) Find the perimeter of the remaining piece of cardboard
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Answer:
Area of the cardboard = 90 x80 = 7200 cm²
area of the piece = 15x20 = 300cm²
area of the remaining cardboard = 7200 - 300
= 6900 cm²
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