Area of rectangle is lenth by breath.So mm by mm will give area of mm square.
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Its width workks out as 64.5 mm and so area is: 64.5*78.3 = 5050.35 square mm
2279.7112 sq mm
(5.4*2.6)^0.5 = 3.75mm
It is: 22.9*40.4 = 925.16 square mm
Rectangle area = (rectangle width) x (rectangle height)