Reference Angles

What is a coterminal angle?

• any 2 angles that are exactly a full rotation apart

• any 2 angles where 1 is positive and 1 is negative

What is a reference angle?

• a coterminal angle with 2 rotations

• a right angle with a vertex at (0,0)

• an acute angle between the angle and the x axis

• a rotating angle between the +x and -x axis

What will the Q3 angle be with this common reference angle?

Why are these 4 angles called having "common reference" angles?

• because they all have their own reference angle

• because they don't have a similar reference angle

• because they all have the same reference angle