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the banner over the finish line of a race is 400 cm long and 85 cm high. what is the area of the banner?

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The area of the banner in cm squared is 400x 85 or 34000 sq cm but a less cumbersome number is 400cm = 4m (100 cm to 1 metre) and 85 cm = 0.85m so 4m x 0.85m= 3.4 sq metres for the area of the banner in manageable units.
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User Piotr Kwiatek
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