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# 7thmathformula18

### 7th grade formulas for math

Names of FormulasFormula
Area of a Square A=s^2
Area of a Rectangle A=bh
Area of a Triangle A=bh/2
Area of a Circle A=pi(3.14)r^2
Circumference of a Circle C=pid or C=2pir
Perimeter of a Rectangle P=2L+2w
Perimeter of a Triangle P=s1+s2+s3
Perimeter of Any Shape P=sum of all sides
Constant of Proportionality y=kx and k=y/x
Percent Proportion is/of=%/100
Percent of Change Proportion change=big-small change/original=%/100
Tax,Tip,Markup,Commission is/of=%/100,then (+)
Sales,Discount,Markdown is/of=%/100 then,(-)
% of Error =|EV-AV| -
Simple Interest I=prt
Created by: 18klutzj