Collection of Formula

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Figures

Circumference

Area

Rectangle

2 (l + b )

L x b

Square

4x

x²

Hexagon

6a

A²√3×6/4

Octagon

8a

2a² (√2
+1)

 

Circle

ñd = 2ñr

Ñd²/4 = ñr²

Hollow circle

 

ñ/4 ( D ²
– d ²) = ñ ( R³ – r² )

Prism

Area of base x height

Perimeter of base x height

Cylinder

Ñr²h

Laterial =
2ñRh

Whole =
2ñrh ( h + E )

Sphere

Ñd²

Ñd²/6

Cone

Ñx²h/3

Circumference
x slant height x 1/2

 

·       Ñ = symbol of pie

·       L = length

·       A = side

·       R = Radius

 

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