for area you times the two numbers and for perimeter you add the numbers
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A simple example would be a square that is ten inches by ten inches. To find the area multiply the length by the width, 10 x 10 = 100in2 (or 100 square inches). To find the perimeter of the square, 10 + 10 + 10 + 10 = 40 inches (or 10 x 4 = 40 inches).
Perimeter is the distance around the figure. Add all sides. Area depends on the figure. Triangle --- 1/2 bh Rectangle --- lw. Others --- divide into triangles and find the area of each triangle then add all together.
To find the perimeter you add and to find the area we multiply.
NO. This is the way to get the volume of a prism, not the surface area of any three-dimensional figure. To find the surface area of a three-dimensional figure, you must find the area of each of its faces and then add the side-areas together.
You find perimeter by adding all the sides of a figure.
That is not true: for a pyramid, for example.