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# 7th math formulas 5

### formulas for 7th grade math

TermDefinition
area of sqaure A=s^2
area of rectangle A=bh
area of a triangle A=bh/2
area of a circle A=IIr ^2
circumference of a circle C= IId or C=2IIr
perimeter of a rectangle P=2 L + 2w
perimeter of a triangle P= sl+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/original =%/100
tax,tip,markup,commission is/of =%/100, than (+)
sales,discount,markdown is/of= %/100 then (-)
% of error EV-AV/AV x 100%
simple interest I=prt
Created by: 18guillg