Reference Angles

any 2 angles that are exactly a full rotation apart

any 2 angles where 1 is positive and 1 is negative

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

$$10\degree$$

$$20\degree$$

$$30\degree$$

$$40\degree$$

$$200\degree$$

$$215\degree$$

$$225\degree$$

$$250$$

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