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At what point does the terminal side of the angle 7π/4 in standard position intersect the unit circle?

 

(-√2 / 2, −√2 / 2)

 

(-√2 / 2,  √2 / 2)

 

(√2 / 2, −√2 / 2)

 

(√2 / 2, √2 / 2)

Guest Nov 12, 2018
 #1
avatar+92608 
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7pi / 4  is a 45°  reference angle in the 4th quadrant

 

A 45°  angle in the first quadrant has the coordinates  (√2 / 2, √2 / 2)

 

But...in the 4th quadrant, the y coordinate is negative....so

 

(√2 / 2,  - √2 / 2)

 

 

cool cool cool

CPhill  Nov 12, 2018

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