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7 math formulas STC

Area of a square A=s^2
area of a rectangle A=b.h
area of a triangle A=b.h/2
area of a circle A=3.14 r^2
circumference of a circle C=3.14 d or C=2 3.14 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/original=%/100
tax,tip,markup,commission is/of=%/100,then add
sales,discount,markdown is/of=%/100,then -
% of error =ev-av/av times 100%
simple interest I=PxRxT
Created by: 18cortis