unit circle intro to pyth identity...unit circle intro to pyth identity may 09, 2016 45ounit special...
TRANSCRIPT
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Unit circle intro to pyth identity May 09, 2016
FTF8 Pythagorean Identity
Objective: Students will be able to recognize parts of the unit circle. They will use the unit circle to prove one of the pythagorean identities.
List on your notes things that you recall about the coordinate plane:
Goal to show how we label a point.
Working with Quadrant 1, let's see what we can label on our own.
Now, lets look at a specific part of the unit circle.
Goal to draw a right triangle and have students recognize what the sides are on the triangle.
θ
Given the reference angle, Label the triangle with Hypotenuse Adjacent, and Opposite
Unit Special Right 60o
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Unit circle intro to pyth identity May 09, 2016
Unit Special Right 45o Unit Special Right 30o
The UNIT CIRCLEAll are unique points
located on the coordinate plane
to make a circle with the radius of 1.
In Math 2, you need to know the highlighted part.
In Math 3, you need to know the highlighted part. For those of you going beyond, their is still more to the unit circle.
θ
Let us start with this triangle.* Go ahead label the parts with hyp, opp, adj
We will prove sin2 θ + cos2 θ = 1, using the Pythagorean Theorem.
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Unit circle intro to pyth identity May 09, 2016
The Pythagorean Identities in Trigonometry are: sin2 θ + cos2 θ = 1
tan2 θ + 1 = sec2 θ
1 + cot2 θ = csc2 θ
We will only focus on one for the class.
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Attachments
Using Pythagorean Identity wksht.docx
NAME:_________________________________ Row# ____________
Using a Pythagorean Identity
lesson
18-5
Practice and Problem Solving: Modified
Use the given value to calculate the values of the indicated trigonometric functions. Round your answers to three decimal places.
1.Given that cos 0.5, where 0 90o , find sin
2.Given that cos 0.707, where 0 90o , find sin
Solve.
3.
4.
IM2 Pythagorean Identity
.
q
q
SMART Notebook
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