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# 7th math formula 17

### Formulas for 7th grade math

TermDefinition
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= pie r^2
Circumference of a Circle C=pi d or C= 2pie r
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,Commission is/of=%/100,then (+)
Sales,Discount,Markdown is/of=%/100,then (-)
% of error =[ev-av/av]x 100%
Simple interest I=PRT
Created by: 18ortizm