UNIT CIRCLE
ONE POINT · SIN & COS LIVE
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Unit Circle
A
S
T
C
90°
180°
270°
360°
y = sin θ
P
θ
=
angle
sin
θ
=
height (y)
cos
θ
=
base (x)
1. Ratios (r = 1)
sin θ = y / r
cos θ = x / r
tan θ = y / x
tan θ =
2. Special Angles
sin θ
0°
0
30°
1/2
45°
1/√2
60°
√3/2
90°
1
3. Remember: ASTC
All · Sin · Tan · Cos (Q1 → Q4)
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