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Lessons 1 5.notebook
1
February 04, 2015
Finding the Missing Side(Using Trig)
Intermediate Algebra HVCC
Quarter 3
Trigonometry
Objectives:
• Students can examine a right triangle and determine relationships based on trigonometry.
Lessons 1 5.notebook
2
February 04, 2015
Gettin' Triggy Wit It?
http://www.youtube.com/watch?v=t2uPYYLH4Zo
Now that we can set up trig ratios, we can use them to find missing
information.
Today we will use trigonometry to find the lengths of missing sides in
right triangles.
I can find the missing side using Trig
Lessons 1 5.notebook
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February 04, 2015
Steps: 1. Find your angle.2. Determine what sides you have in relation to the given angle. (Opp., Adj, or Hyp.)3. Are you using sin, cos, or tan?4. Set up your equation and solve.
10
30x
Example #1: Find x to the nearest tenth.
I can find the missing side using Trig
x25
32
Example #2: Find x to the nearest tenth.
I can find the missing side using Trig
Lessons 1 5.notebook
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February 04, 2015
17
11 x
Example #3: Find x to the nearest tenth.
I can find the missing side using Trig
9
51
x
Example #4: Find x to the nearest tenth.
27
63 x
Example #5: Find x to the nearest tenth.
I can find the missing side using Trig
Lessons 1 5.notebook
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February 04, 2015
From a point, G, on the ground, the angle of elevation of an
airplane is 21º. The altitude of the plane is 2200 meters. What is the distance from point G to the airplane, to the nearest tenth
of a meter?
I can find the missing side using Trig
A girl is flying a kite on a windy day. The length of her kite string is 40 feet. She is holding the string at angle of 45 degrees. Find the height of her kite, to the nearest tenth if the girl is holding the kite 3.5 feet
above the ground.
40
45
3.5
x
I can find the missing side using Trig
Lessons 1 5.notebook
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February 04, 2015
100
65
x
A man is standing 100 meters from the NASA building. There is a bird at the top of the building looking down at
the man. The bird's line of sight makes a 65 degree angle with the building. How tall is the building to
the nearest meter?
I can find the missing side using Trig
Homework:p. 2 3 evens
Homework
