1. LAW OF COSINES

2. Example 1: Solve the following….B
14 ft
8 ft A
19 ft C

3. Example 2: Solve the following….
5 cm
8 cm
12 cm

4. Example 3: Solve the following….
15 cm
115˚
10 cm

5. Example 4: Solve the following….
18 ft
46.5˚
10.5 ft

6. Solve the following….
2.3 mi

7. Another….
211ft

8. Heron’s Formula

9. Ex 1. Find the area of the following triangle.
a = 43m b = 53m c = 72m

10. Ex 2. Find the Area of the Triangle
a = b = 52 m c = 28 m
361.8 m2

11. Solve the following:
17,452 ft2

12. One more….
Land in downtown Columbia is valued at $20 a square foot. What is the value of a triangular lot with sides of lengths 112, 148, and 190 feet?
$165,554

13. Determine whether the Law of Sines or the Law of Cosines is needed to solve each of the triangles.
a.) A = 15o, B = 58o, c = 94
b.) a = 96, b = 43, A = 105o
c.) a = 24, b = 16, c = 29
d.) a = 15, c = 42, B = 49o
Law of Sines
Law of Sines
Law of Cosines
Law of Cosines

14. BRING YOUR BOOK TOMORROW!
HOMEWORK
Pg. 423
#’s 1 – 33 odd
BRING YOUR BOOK TOMORROW!

15. Partner Problems
pg #’s 2, 10, 18, 24, 28, 32, 34, 39, 41, 48
*Quiz Tomorrow