W 3 m k e i+ c untunt.  This Week at a Glance  Return Ch. 13 Quizzes  13.5A Notes  Assignment: 13.5 Skills Practice.

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Presentation transcript:

w 3 m k e i+ c untunt

 This Week at a Glance  Return Ch. 13 Quizzes  13.5A Notes  Assignment: 13.5 Skills Practice

 Monday: 13.5A Law of Cosines  Tuesday: 13.5B Law of Cosines  Wednesday: Ch. 13A Review  Thursday: Ch. 13A Test  Friday: Begin Ch. 13B ~ Unit Circle

2) Write an equation involving sine, cosine, or tangent that can be used to find x. Then solve the equation, rounding to the nearest degree.

Solve 3) Solve ∆ABC if m  A = 20 , m  C = 90 , and b = 10. Round measures of sides to the nearest tenth and measures of angles to the nearest degree.

4) Using the Law of Sines, find the measure of angle A when c = 15, m  B = 50 , and b = A B C

 solve problems by using Law of Cosines.

Example 1-4a TermDefinitionExample Law of Cosines In any  ABC, Use Law of Sines when given _______, or _______. SAS SSS c A C a B b a 2 = b 2 + c 2 – 2bc  cos A b 2 = a 2 + c 2 – 2ac  cos B c 2 = a 2 + b 2 – 2ab  cos C

In  ABC, find c.

In  ABC, find r. r

A ranger tower at point A is directly north of a ranger tower at point B. A fire at point C is observed from both towers. The distance from the fire to tower A is 60 miles, and the distance from the fire to tower B is 50 miles. If m  ACB = 62 , find the difference between the towers. A B C c

13.5 Skills Practice #1 – 6