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The formula for perimeter varies based on what object you are trying to determine the perimeter for.

If you are looking for the perimeter of a perfect square you simply take the length of one side and multiply it by four.

If you are looking for the perimeter of a rectangle with length (a) and width (b) you would multiple the length (a) by two and the width (b) by two and add them together. Perimeter = 2a + 2b

If you are looking for the perimeter of a rectangle you add up the lengths of all the sides.

To find the perimeter of a circle you multiple the radius by 2pi. pi = 3.14159265

the perimeter = 2 * 3.14159265 * r

Or if you have the diameter of the circle you would just have to multiply the diameter by pi. So, perimeter = 3.14159265 * d

Radius is the length of a line that goes from the middle of a circle to the edge of the circle.

Diameter is the length of a line that goes from one edge of a through the middle to another edge of the circle.

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12y ago
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14y ago

Its P= A+B+c where A, B and C are the sides of the triangle and P = the perimeter

example

side a=12cm, side b=12cm and side c= 20cm

therefore 12+12+20 = (P) 44cm (centimetres)

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8y ago

If it is a regular octagon, all sides are of equal length, so multiply the length of one side by 8 to get the perimeter.

For an irregular octagon add together the length of each of the eight sides to get the perimeter.

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12y ago

for polygons, add up the lengths of all the sides. for circles, multiply the diameter of the circle squared by pi (3.14)

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14y ago

If you double its length and double its width and add those two amounts together you have the perimeter.

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11y ago
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14y ago

check 1 side x 5

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Q: Determine the perimeter of a rectangle?
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