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# hampton

### Formula 7 grade math

TermDefinition
Area of a square A= s^2
Area of a triangle A=bh/2
Area of a circle A=pir^2
Area of a rectangle A=bh
circumference of a circle C=pid or C=2pir
perimeter of a rectangle P=2l+2w
perimeter of a triangle P=sl+s2+s3
perimeter of any shape P=sum of all sides
constant of proportion Y=kx andk=y/x
percent proportion is/of = %/100
percent of change proportion change/original=%/100
tax,tip,markup,commission is/of=%/100,then(+)
sales,discount,markdown is/of=%/100,the(-)
% of Error =Ev-Av/Av x100
simple interest I=PRT
Created by: 18hamptd