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LAW OF COSINES
Example 1: Solve the following….
B
A
C
14 ft8 ft
19 ft
Example 2: Solve the following….
5 cm 8 cm
12 cm
15 cm
115˚10 cm
Example 3: Solve the following….
Example 4: Solve the following….
18 ft
10.5 ft
46.5˚
Solve the following….
2.3 mi
Another….
211ft
Heron’s Formula
Ex 1. Find the area of the following triangle.
a = 43m b = 53m c = 72m
Ex 2. Find the Area of the Triangle
a =31 b = 52 m c = 28 m
361.8 m2
Solve the following:
17,452 ft2
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
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
HOMEWORK
Pg. 423
#’s 1 – 33 oddBRING YOUR BOOK
TOMORROW!
Partner Problems
•pg. 423 #’s 2, 10, 18, 24, 28, 32, 34, 39, 41, 48
*Quiz Tomorrow
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