geo

partition postulate

a whole is equal to the sum of its parts (congruency also follows)

Reflexive postualate

A quantity is equal to itself

Symetric property

a quantity may be expressed in either order

if a=b then b=a

transitive property

quantites equal to the same quantity are equal to each other

think chain rule

substitution postulate

a qunatity may be substitued for its equal in any statement of equality

addition postulate

if a=b and c=d, the a+c = b+d

substitution postulate

if a=b and c=d, then a-c = b-d