Algebra 2
Monday, May 04, 2009
Section 12.9: Areas of Triangles
B
c
A
Area of a Triangle Formula:
a
h
b
C
If you only knew C and a, how could you find h?
Area of a Non-Right Triangle:
1
Algebra 2
Monday, May 04, 2009
Section 12.9: Areas of Triangles
Example: Find the area of ΔABC, if b = 5 , c = 8 ,
and A = 115°.
2
Algebra 2
Monday, May 04, 2009
Section 12.9: Areas of Triangles
Example: Find the area of ΔABC, if
A = 40° ,
B = 70° , and c = 2.
3
Algebra 2
Monday, May 04, 2009
Section 12.9: Areas of Triangles
Example: Find the area of ΔABC, if a = 12 , b = 8 ,
and c = 13.
4