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LAW OF COSINES. Example 1: Solve the following…. B A C 14 ft 8 ft 19 ft.

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Presentation on theme: "LAW OF COSINES. Example 1: Solve the following…. B A C 14 ft 8 ft 19 ft."— Presentation transcript:

1 LAW OF COSINES

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

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

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

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

6 Solve the following…. 2.3 mi

7 Another…. 211ft

8 Herons 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 =31 b = 52 m c = 28 m m 2

11 Solve the following: 17,452 ft 2

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 = 15 o, B = 58 o, c = 94 b.) a = 96, b = 43, A = 105 o c.) a = 24, b = 16, c = 29 d.) a = 15, c = 42, B = 49 o Law of Sines Law of Cosines

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

15 Partner Problems pg. 423 #s 2, 10, 18, 24, 28, 32, 34, 39, 41, 48 *Quiz Tomorrow


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