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A circumference is the distance around a circle. To find a circle's circumference you need to follow the formula: d*pi The d stands for diameter and pi is 3.14. You need to mulitply the length of the diameter by pi for the circumference. Or, if the diameter isn't given, multiply the radius by 2 and then multiply that by pi.
You only need to know the length of one side. Knowing the side length (s) you can find the area (multiply s by s) and perimeter (multiply s by 4)
you need length and width length multiply width = area length + length + width + width = perimeter
You need to multiply the length, width, and height.
You cannot find the area of a rectangle if you only know its length. You need to know its width too. Then you multiply its length by its width.