math equations

area of circle

pie r squared

circle circumference

pie diameter

equation of circle

x² + y² = r²

equation of line

y = mx + c

direct proportion

y = kx

indirect proportion

y = k/x

volume of a cone

1/3 pie r² h

SA of curved cone

pie r L

area of triangle

½ b h

n.o of sides

(n-2) x 180

density =

mass / volume

sin rule

A / sin A = B / sinB = C / sinC

or

sin A / A = sinB / B = sinC / C

cos rule

cosA = b² + c² - a² / 2bc

or

a² = b² + c² - 2bcCosA