Angles and Unit Circle

Which LETTERS on the given unit circle are related to the given type of reference angle?

45°

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OFF

Which LETTERS on the given unit circle are related to the given type of reference angle?
\frac{\pi}{2} radians

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OFF

State the EXACT COORDINATE on the given unit circle is related to the given LETTER of reference angle? (use root or sqrt to signify radical in answer when needed) given letter L

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OFF

State the EXACT COORDINATE on the given unit circle is related to the given LETTER of reference angle? (use root or sqrt to signify radical in answer when needed) given letter D

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OFF

What type of circle plays a large role in understanding trig functions?

• An elliptic circle

• The unit circle

• The perfect circle

• The Pythagorean circle

• 1
• 2
• 3
• 4

• undefined

Answer explanation

Using θ as a reference angle, mark the triangle sides as Opp, Adj, and Hyp. Label these on the triangle on your paper.

• Opp

• y

• Hyp

• x

• Adj

• OP

What is the radius of a unit circle?

• 1

• 2

• 1/2

• 0

Which function corresponds to the y-coordinate on the unit circle?

• sine

• cosine

• tangent

• secant