To find the area of a rectangle, multiply the length by the width. 3 x 5 = 15. Do not forget to include the units, however - if the units of the rectangle are in inches, then the answer to the question will be 15 inches squared (15 in2).
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15
It's half the area of a rectangle
Area of a rectangle = length x width
Area of a rectangle: a = l * w
Area of a square/rectangle=its length × its width