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Identify unit-circle coordinates for key quadrantal angles
Worksheet
Grade Level
Trigonometry
TRIG.42 Identify unit-circle coordinates for key quadrantal angles
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A student switches the coordinates at theta = pi/2 radians and writes (1, 0). Which response is correct?
A
Use (0, 1), because cosine is first and sine is second
B
Use (1, 0), because sine is first and cosine is second
C
Use (-1, 0), because pi/2 is on the negative x-axis
D
Use (0, -1), because pi/2 is on the negative y-axis
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