Asked by Aria
What angle in the first quadrant could you reference to help you find sine and cosine of each of the following angles ?
330
120
113
203
330
120
113
203
Answers
Answered by
Reiny
I ask myself, "how far from the x-axis is my given angle"
After I decide which quadrants the given angle is in, I go
in II: 180 - angle
in III: angle - 180
in IV: 360 - angle
e.g. for 330ยฐ , which is in IV
reference angle = 360-330 = 30ยฐ
...
for 203, which is in III
reference angle = 203-180 = 23ยฐ
do the others the same way
After I decide which quadrants the given angle is in, I go
in II: 180 - angle
in III: angle - 180
in IV: 360 - angle
e.g. for 330ยฐ , which is in IV
reference angle = 360-330 = 30ยฐ
...
for 203, which is in III
reference angle = 203-180 = 23ยฐ
do the others the same way
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