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# 7th formulas math 12

### 7th grade math formulas

TermDefinition
Area of a spquare A=^2
Area of 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=pie d or C=2 pie r
perimeter of a rectangle P=2L+2w
perimaeter of a triangle P=s1+s2+s3
perimeter of any shape P=sum of all sides
constant of propyionality Y=kx and K=y/x
Percent proportion is/of=%/100
percent of change proportion change/origanal=%/100
tax,tip,markup,commission is/of=%/100,(then +)
sales,discount,markdown is/of=%/100,then(-)
% of error = [ev-av/av]x100%
simple interest I=prt
Created by: 18seamoa