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3U Math Trig Day 1 PreTrig Review.notebook
1
November 10, 2015
Apr 1311:29 AM
Trigonometry Part 1PreTrig ReviewBy the end of this lesson you should be able to use Pythagorean theorem, SOHCAHTOA, the Sine Law and the Cosine Law.
Learning Goal
Apr 28:56 PM
1 The sum of the interior angles of a triangle add up to _______º.
Apr 1311:32 AM
Pythagorean TheoremReviewing the Basics
• c2 = a2 + b2• The hypotenuse is labeled c • Only works on right angle triangles
Example. Determine the measure of the missing side.
12m
5m
Feb 710:03 AM
3U Math Trig Day 1 PreTrig Review.notebook
2
November 10, 2015
Apr 1311:36 AM
θ
θ
Hypotenuse
Adjacent
Opposite
SOHCAHTOAReviewing the Basics
• Relationship between a trig function and the ratio of two sides of a triangle• Only works on right angle triangles
Example. Label the following triangles.
Hypotenuse Hypotenuse
Opposite
OppositeAdjacent
Adjacent
Apr 1311:42 AM
θ Hypotenuse
Adjacent
Opposite
sinθ =
cosθ =
tanθ =
Primary Trig
Ratios
Trig Ratios: SOHCAHTOAReviewing the Basics
Apr 243:57 PM
Example. State the primary trig ratios for the following for angle x.
10cm
6cm
8cm
x
Apr 27:57 PM
Example. A ladder is leaning against a wall with an angle of elevation of 40º. The base of the ladder is 2m away from the base of the wall. Determine the length of the ladder to one decimal place.
3U Math Trig Day 1 PreTrig Review.notebook
3
November 10, 2015
Apr 1311:44 AM
Example. Determine the measure of angle θ. Round your answer to the nearest degree.
3km
5km
Mar 291:36 AM
2 cos P = 0.886. What is ∠P to the nearest degree?
A 0.99°
B 27°
C 1°
D 28°
Apr 1311:42 AM
Sine LawReviewing the Basics
Can be used to solve an acute triangle when given the measures of:• two angles and any one side• two sides and an angle opposite one of these sides
Mar 291:02 AM
Example. In an acute ∆DEF, ∠F = 35°, f = 42m, and d = 64m. Find ∠D to the nearest degree.
3U Math Trig Day 1 PreTrig Review.notebook
4
November 10, 2015
Mar 2912:37 AM
Cosine LawReviewing the Basics
Can be used when given:• two sides and the contained angle• three sides
Mar 2912:53 AM
Example. In ∆KLM, k = 20cm, l = 22cm, m = 18cm. Solve for ∠K to the nearest degree
Mar 291:51 AM
Example. In ∆ABC, ∠B = 42°, a = 52m, and c = 36m. Find b to the nearest metre.
Mar 291:33 AM
3 Given the following triangle, you are asked to solve for Angle C. What method would you use?
A Sine Law
B Cosine Law
C Any of the Primary Trig Ratios
D Use the Pythagorean Theorem
3U Math Trig Day 1 PreTrig Review.notebook
5
November 10, 2015
Mar 291:19 AM
4 Which of the following does NOT represent a situation in which you can use the cosine law?
A Given all three sides of a triangle
B Given two angles and three sides of a triangle
C Given two sides and the angle contained between them
D Given all three angles of a triangle
Apr 28:18 PM
Homework:Page 17 #1, 16Page 24 #1, 12, 14Page 35 #4, 5, 8, 12