Area is a physical quantity expressing the size of a part of a surface. The termSurface area is the summation of the areas of the exposed sides of an object. Units Units for measuring surface area include: square metre = SI derived unit are = 100 square metres hectare = 10,000 square metres square kilometre = 1,000,000 square metres square megametre = 10^12 square metres square yard = 9 square feet = 0.83612736 square metres square perch = 30.25 square yards = 25.2928526 square metres acre = 160 square perches or 43,560 square feet = 4046.8564224 square metres square mile = 640 acres = 2.5899881103 square kilometres Useful formulae }s^2,!|s is the length of one side of the hexagon.|-|Regular octagon|2(1+sqrt)s^2,!|s is the length of one side of

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