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 330° , which is in IV
reference angle = 360-330 = 30°
...
for 203, which is in III
reference angle = 203-180 = 23°
do the others the same way
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
1 answer
1 answer