With a circle use the formula Pi x D, where Pi is a constant and D is the diameter. With polygons it is the sum of the length of the sides
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Measre the length of all the sides and add them together. For some shapes, there are formulae to simplify this process but the formula depends on the shape.
Measure the length of each side or the curves that make up the boundaries of the shape and add these lengths together.
Plus the side
It depends what shape the section is, ie what the length and width are. If you can specify this I can work out the perimeter length.
the ratio of the perimeter of triangle ABC to the perimeter of triangle JKL is 2:1. what is the perimeter of triangle JKL?
You simply have to measure all the sides of the oblong and add them together. If the opposite sides of it are equal (making it a rectangle), then you just need to measure the two different sides and add them together, then multiplying the result by 2. perimeter = a + b + c +d or perimeter = 2(a+b)
What is the perimeter of a square