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It depends what shape you are trying to find. If it is a circle, use the following:
C = Dpi
Circumference = Diameter x Pi
Take the diameter of the circle, or twice the radius, and multiply it by pi, which is ~3.14
If it is any other shape, just add up the sides if they are given.
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What formula do you use to find the perimiter of a circle?
2 * pi * r
What is the formula for finding the perimiter of a parallelogram?
Add the four sides.
How do you find the area and perimiter of a triangle?
To find the area of a triangle find the base and the height of the triangle. Then multiply the base by the height, then divide by 2. To find the perimiter of a triangle add together the outside edge of the triangle. To find the area of a triangle find the base and the height of the triangle. Then multiply the base by the height, then divide by 2. To find the perimiter of a triangle add together the outside edge of the triangle.
What is the purpose of heron's formula?
Heron's formula, is basically a way to find the are of any triangle, as long as it has the sides of a, b, and c. For example, if a scalene has sides of 12, 15, and 7, you can use heron's formula to find the area. The formula is the square root of s(s-a)(s-b)(s-c). S is basicall half of the perimiter, and a, b, and c are the lengths of the sides.
What formula do you use to find perimeter?
well, you really have to add up the sides. if you have a 7 by 34 rectangle, you add up like this; 7+7+34+34. it'll be the perimiter around the shape
