These are the following ways to calculate the perimeter for 2D shapes

Square

P=4s

S = the length of the side of the square.

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Rectangle

P=2b+2a

a and b= the lengths of the rectangle's sides (length and width).

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Triangle

a+b+c

a,b, and c = the side lengths.

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Right Triangle, with legs a and b

P=x+y+((x^2+y^2)^(1/2))

x and y= the lengths of the two legs of the triangle

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Circle

P=C=2πr=πd

r = the radius

d = the diameter.

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Cuboid

4 (l + b + h)

l =the length

b =the depth

h =the height

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Cube

**12** x **a**

a = the length

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Parallelogram

2 (a + b)

“a” and “b” =the sides

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Trapezoid

a + b + c + d

a, b, c, d = the sides of the trapezoid

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Kite

2a + 2b

a = Length of the first pair

b = Length of the second pair

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Rhombus

P= 4 × a

a = Length of the side of the rhombus

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Hexagon

6 x a

a = Length of a side

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164 ITEMS