Intro Unit Circle

What is the radius length of a unit circle?

• 1

• 0

• 1

• 0

• 1

• 0

• 1

• 0

Which angle satisfies the equation cosx = 0? Select all that apply

• x = π/2

• x = π

• x = 240º

• x = 270º

Match the following vocabulary related to the Unit Circle

• quadrantal angle

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

• radian

• the length of the curve formed by an arc

• arc length

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

• Pythagorean Identity

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

• radian measure

• an angle whose terminal sides lies on an axis

What is the radius of a unit circle?

• 1

• 2

• 1/2

• 0

• 1/2

• undefined-1