Introduction to Unit Circle

The x value on the unit circle is defined by which function?

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CCSS.HSF.TF.A.2

The y value on the unit circle is defined by which function?

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CCSS.HSF.TF.A.2

Why do we want to think of trig functions instead of triangle trig when we start looking at the unit circle?

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CCSS.HSF.TF.A.2

Estimate the value of \theta

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CCSS.HSF.TF.A.2

What is the radius of the unit circle?

• 0

• 1

• 1/2

• √2/2

Tags

CCSS.HSF.TF.A.2

Match the following vocabulary related to the Unit Circle

• quadrantal angle

• an angle whose terminal sides lies on an axis

• radian

• states that the square of the cosine of a given angle + the square of the sine of that angle = 1

• arc length

• the length of the curve formed by an arc

• radian measure

• measure of a central angle of a circle that intercepts an arc = in length to the r of that circle

• Pythagorean Identity

• the ratio of the arc length formed by an angle divided by the r of that circle

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CCSS.HSF.TF.A.1

What is the radius of a unit circle?

• 1

• 2

• 1/2

• 0

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CCSS.HSF.TF.A.2

• Choice 1

• Choice 2

• Choice 3

• Choice 4

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CCSS.HSF.TF.A.2

What is this jawnski called?

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CCSS.HSF.TF.A.2

Select ALL that apply: Which of the following is a point on the unit circle?

• (1, 1)

• (-1, 0)

Tags

CCSS.HSF.TF.A.2