$\"\"$

(a)

The angle is $\"\"$ .

For the positive angle $\"\"$ , subtract $\"\"$ to obtain a co - terminal angle.

$\"\"$ .

For the negative angle $\"\"$ , add $\"\"$ to obtain a co - terminal angle.

$\"\"$ . $\"\"$

(b)

The angle is $\"\"$ .

For the positive angle $\"\"$ , subtract $\"\"$ to obtain a co - terminal angle.

$\"\"$ .

For the negative angle $\"\"$ , add $\"\"$ to obtain a co - terminal angle.

$\"\"$ . $\"\"$

(a) The positive and negative angles of $\"\"$ are $\"\"$ and $\"\"$ .

(b) The positive and negative angles of $\"\"$ are $\"\"$ and $\"\"$ .