1. Reference angle of 60

Solution:
`60 ^circ` is in the first quadrant

The Reference angle of `60 ^circ`

`=60 ^circ`

---

2. Reference angle of 120

Solution:
`120 ^circ` is in the second quadrant

The Reference angle of `120 ^circ`

`=180 ^circ-120 ^circ`

`=60 ^circ`

---

3. Reference angle of 200

Solution:
`200 ^circ` is in the third quadrant

The Reference angle of `200 ^circ`

`=200 ^circ-180 ^circ`

`=20 ^circ`

---

4. Reference angle of 300

Solution:
`300 ^circ` is in the forth quadrant

The Reference angle of `300 ^circ`

`=360 ^circ-300 ^circ`

`=60 ^circ`

---