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The given dimensions are incorrect for it to be a square because a square has 4 equal sides and its area in square units is: a side times a side.
we know by definition that 10mm = 1cm if we square both sides we get 100mm2 = 1cm2 so if you have an area given in square millimeters, divide by 100 to get the are in square centimeters.
== 1 centimeter== 10mm == 1 centimeter= 10mm 8 mm= .8 centimeter === ===
10mm=1cm therefore 90mm=9cm
Area = 7.96 mm2 approx.