$\"\"$

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(a).

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The angle is $\"\"$ .

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Convert the angle into radian measure.

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$\"\"$

\

$\"\"$

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(b).

\

The angle is $\"\"$ .

\

Convert the angle into radian measure.

\

$\"\"$

\

$\"\"$

\

(a) The angle is $\"\"$ .

\

(b) The angle is $\"\"$ .