Study Flashcards
1
Q
For an angle θ, pick point P=(x,y) on its terminal side. Then:
A
r= √x^2 + y^2
2
Q
If P is a point on the circle x^2+y^2=1 (unit circle), then
A
sin θ=y and cos θ=x and
sin^2 θ + cos^2 θ = 1
3
Q
For π/2 < θ < π
A
θ’ = π - θ
4
Q
θ’ = π - θ
A
For π/2 < θ < π
5
Q
For π < θ < 3π/2
A
θ’ = θ - π
6
Q
θ’ = θ - π
A
For π < θ < 3π/2
7
Q
For 3π/2 < θ < 2π
A
θ’ = 2π - θ
8
Q
θ’ = 2π - θ
A
For 3π/2 < θ < 2π
9
Q
Complementary angles add to
A
90 degrees
10
Q
Add to 90 degrees
A
Complementary angles
11
Q
Supplementary angles add to
A
180 degrees
12
Q
Add to 180 degrees
A
Supplementary
13
Q
For 30 60 90 triangles on unit circle
A
√3 is x, 1 is y, 2 is hypotenuse
14
Q
√3 is x, 1 is y, 2 is hypotenuse
A
For 30 60 90 triangles on unit circle
15
Q
For 45 45 90 triangles unit circle
A
1 as x, 1 as y, √2 as hypotenuse
