3. The unit circle Flashcards
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What is the standard equation of a circle?
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Why is the unit circle called the unit circle?
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What are the unit circles intersection points on the x and y axis?
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What are the degrees, radians, and coordinate points in the 1st, 2nd 3rd, and 4th quadrant at the 30, 45, 60 and 90 degree points?
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Using the unit circle, what is the value of sin and cos at the 30 degree point?
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What can we say about the value of an angle for a set of coterminal angles.
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What is the formula for finding coterminal angles?
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What do we set up to find the coterminal angles in a particular interval?
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What is a reference angle?
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Must reference angles always be positive?
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What is the formula for finding the reference angle in each quadrant?
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How do you notate all the coterminal angles that can satisfy a trig equation, using cos(x) = 0 as an example?
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What is the formula for finding the sine and cosine for a point not on the unit circle?
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What does “completing a right triangle” mean?
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What are the two formulas used to complete a right triangle?
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What is angle of elevation?
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What is angle of depression?
