Equations of area and perimeter

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Last updated 4:26 AM on 4/30/26
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17 Terms

1
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Area of circle


A=πr²

2
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Circumference of a Circle


C=2πr

3
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Arc Length

arc length = (angle/360) * 2πr

4
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Sector Area

area = (angle/360) * πr²

5
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Area of a Rectangle


A=bh

6
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Perimeter of a Rectangle


P=2l+2w

7
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Area of a Square


A=s²

8
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Perimeter of a Square


P=4s

9
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Area of a Paralellogram


A=bh

10
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Perimeter of a Paralellogram

A=2a+2b

11
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Area of a Trapeziod


A=1/2(b1+b2)*h

12
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Perimeter of a Trapezoid


P=a+b+c+d

13
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Area of a Triangle


A= 1/2 bh

14
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Perimeter of a Triangle


P=a+b+c

15
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Area of a Regular Polygon


A = 1/2 a P (a is "apothem")

16
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Perimeter of a Regular Polygon


P = n x s

17
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Definition of a Regular Polygon


a polygon where all of the sides and angles are congruent