1. Reference angle of 60

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

The Reference angle of `60 ^circ`

`=60 ^circ`

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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`

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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`

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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`