7'4 Area of a Triangle

1
7.4 Area of a Triangle
c
a
B
A
C
b
Area
2
Herons Formula for area if 3 sides are given
c
B
a
A
C
b
The semi-perimeter is s. Add up the three
sides then divide by 2
3
Find the area ?ABC if b 13, c 15, and
A 71º.
92.19
13
71º
15
4
Find the area ?ABC if a 11, b 5, and c
7.
11
5
7
S 11.5
5
Find the area ?ABC if a 11, b 5, and c
7.
12.97
6
Find the area ?ABC if A 40, B 20, and
a 2.
C 120º
2
40º
20º
7
120º
2
40º
20º
2.69
8
Homework

• Pg 555 1 23 odd, 33 37 odd