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# 7th Math Emma

Name of FormulaFormula
Area of a square A=S^2
Area of a rectangle bxh
Area of a triangle bxh/2
Area of a circle pixr^2
Circumference of a circle pixd or 2xpixr
Perimeter of a rectangle 2L+2W
Primeter of a triangle s1+s2+s3
Perimiter of any shape add all sides
Constamt of proportionality y=kx and k=y/x
Percent proportion is/of=%/100
Percent of change proportion change/original=%/100
Tax, Tip, Markup, Commission is/of=%/100, then add
Sales, discount, markdown is/of=%/100 then subtract
% of error =EV-AV/AAx100
Simple Interest I=prt
Created by: 18garnee