Transcript Section 8-2

Section 8-2
Problem Solving in
Geometry
Cross product property
a c
If  then
b d
ad  bc
Reciprocal property
a c
b d
If 
then 
b d
a c
Additional Properties of
Proportions
a c
a
b

If  , then
b d
c
d
a c
If  , then
b d ab
cd

b
d
Geometric mean
a x

x b
• x is the geometric mean
• a, b, and x are positive numbers!