Common Quadrilaterals

Square

 
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Area, A=a2

Perimeter, P=4a

Diagonal, d=a2

 

Rectangle

 
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Area, A=ab

Perimeter, P=2(a+b)

Diagonal, d=a2+b2

 

Rhombus

 
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Area, A=a2sinθ=ah

Perimeter, P=4a

Shorter diagonal, d1=a22cosθ

longer diagonal, d2=a2+2cosθ

Note: The diagonals of square and rhombus are perpendicular to each other.

 

Parallelogram

 
parallelogram.gif

 

Area, A=absinθ=ah

Perimeter, P=2(a+b)

Shorter diagonal, d1=a2+b22abcosθ

Longer diagonal, d2=a2+b2+2abcosθ

 

Trapezoid

 
trapezoid.gif

 

Area, A=12(a+b)h