Math – formula

[Ref http://www.math.com/tables/geometry/areas.htm]

Area [面積]

square = a 2

rectangle = ab

parallelogram 平行四邊形 = bh

trapezoid 梯形 = h(b1 + b2)/2

circle = pi r 2

ellipse = pi r1 r2

triangle = bh/2

equilateral triangle = [(√3)/4]( a 2 )

 

Perimeter [圓周]

square = 4a

rectangle = 2(a+b)

triangle = a + b + c

circle = 2pi r 

 

Volume [體積]

cube = a 3

rectangular prism = = a b c

cylinder =  pi r 2 h

pyramid = (1/3) b h

cone = (1/3) (pi r 2 h)

sphere = (4/3)( pi r 3)

 

[Physics]
https://dutchpilotgirl.com/math-and-physics/

 

Unit Conversion [Math]

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