In regular quadrilaterals, it's length times width.
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Area = 0.5*base*height
πr2where π=3.14and r is radius
by the w x h x lenght
Area = Length x Width Perimeter = (2 x Length) + (2 x Width)
C = Pi x D, where C is Circumference, Pi = 3.1416, and D is Diameter.