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LAW OF COSINES

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**Example 1: Solve the following….**

B 14 ft 8 ft A 19 ft C

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**Example 2: Solve the following….**

5 cm 8 cm 12 cm

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**Example 3: Solve the following….**

15 cm 115˚ 10 cm

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**Example 4: Solve the following….**

18 ft 46.5˚ 10.5 ft

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Solve the following…. 2.3 mi

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Another…. 211ft

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Heron’s Formula

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**Ex 1. Find the area of the following triangle.**

a = 43m b = 53m c = 72m

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**Ex 2. Find the Area of the Triangle**

a = b = 52 m c = 28 m 361.8 m2

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Solve the following: 17,452 ft2

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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

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**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

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**BRING YOUR BOOK TOMORROW!**

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

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

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