Trig Geometry Flashcards
1
Q
Terminal arm
A
The arm that rotates around the origin counter clockwise to form a positive angel or counterclockwise for a negative angel
2
Q
Principle angle
A
- It is measured fro the initial arm to the terminal arm in a counter clockwise direction
- The angel is between 0 and 360 degrees
3
Q
Reference Angle
A
- It’s between the terminal arm and the closet x-axis
- It’s always positive and less than 90 degrees
4
Q
The reciprocal of sin
A
cosecant (csc)
5
Q
The reciprocal of cos
A
secant (sec)
6
Q
The reciprocal of tan
A
cotangent (cot)
7
Q
To find the angle…
A
- You do the inverse of sin, cos or tan
- Press shift to access inverse
8
Q
Sin ratios
A
O/H or Y/R
9
Q
Cos ratios
A
A/H or X/R
10
Q
Tan ratios
A
O/A or Y/X
11
Q
Sine law can be used for
A
- side, side, angle
- angle, angle, side
12
Q
Cosine law can be used for
A
- side, angle, side
- side, side, side
