Cut it out of a material whose weight per unit of area you know, weigh it, then divide the weight by the weight per unit of area.
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To find the area of a quadrilateral, multiply the length and width of the figure. The product will give you the area of the figure.
TRUE: To find the surface area of a three dimensional figure, you must find the area of each of its faces and then add them together.
Different figures have different rules to determine the area of it.
False.To find the surface area of a three-dimensional figure, find the area of the faces and add them together.
... face and add them together.