Question 178141
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The conversion calculator is right.  And you are right that 1 cm = 10 mm.  But what you did is take the answer in sq cm, 577.5, and then multiplied it by 10.  What you needed to do was take the two given measurements and multiply EACH of them by 10 and then multiply the two measurements.  In effect, that multiplies your sq cm answer by 100, because you have introduced 2 factors of 10.


*[tex \Large (27.5 \times 10) \times (21 \times 10) = 27.5 \times 21 \times 10 \times 10 = 57750.0]


Another way to look at it is if 1 cm = 10 mm, then a sq cm is 1 cm times 1 cm which is the same as 10 mm times 10 mm which is 100 sq mm.


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