Trig Geometry

Question 1

Terminal arm

Answer 1

The arm that rotates around the origin counter clockwise to form a positive angel or counterclockwise for a negative angel

Question 2

Principle angle

Answer 2

• It is measured fro the initial arm to the terminal arm in a counter clockwise direction
• The angel is between 0 and 360 degrees

Question 3

Reference Angle

Answer 3

• It’s between the terminal arm and the closet x-axis
• It’s always positive and less than 90 degrees

Question 4

The reciprocal of sin

Answer 4

cosecant (csc)

Question 5

The reciprocal of cos

Answer 5

secant (sec)

Question 6

The reciprocal of tan

Answer 6

cotangent (cot)

Question 7

To find the angle…

Answer 7

• You do the inverse of sin, cos or tan
• Press shift to access inverse

Question 8

Sin ratios

Answer 8

O/H or Y/R

Question 9

Cos ratios

Answer 9

A/H or X/R

Question 10

Tan ratios

Answer 10

O/A or Y/X

Question 11

Sine law can be used for

Answer 11

• side, side, angle
• angle, angle, side

Question 12

Cosine law can be used for

Answer 12

• side, angle, side
• side, side, side