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Just a Point
Algebra
Level 2
If the blue angle is \( \dfrac{ \pi } { 3} \), which of these expressions cannot represent the above point for some real value \(r \)?
\[ \left( r, \frac{ \pi } { 3} \right) \]
\[ \left(r, \frac{ 2 \pi } { 3}\right) \]
\[ \left(r , \frac{ 5 \pi } { 3}\right) \]
\[\left (r, \frac{ 8 \pi } { 3} \right) \]
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