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# 7th math formulas KB

### Math forumlas

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=pir^2
Circumference of a circle c=pid or c2=pir
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 is/of = %/100y=kx+k=y/w
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,Then (-)
% of error =|EV-Av/Av|x100%
Simple interest I=prt
Created by: 18berrik