If $$ \overleftrightarrow{\mathcal{K}} \perp[\sqrt{N} $$, which statement is true? A. $$ \overleftrightarrow{K} $$ and $$ L \mathbb{M} $$ meet at a straight angle. B. $$ \overparen{J K} $$ and $$ \Sigma M $$ are coplanar and do not intersect C. $$ \overparen{K} $$ and $$ L M $$ are not in the same plane. D. $$ \overleftrightarrow{K} $$ and $$ \mathscr{M} $$ meet at a right angle.

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The given notation appears to describe a perpendicular relationship between two lines or vectors. Specifically, $$ \overleftrightarrow{\mathcal{K}} \perp \mathscr{M} $$ suggests that line $$ \mathcal{K} $$ is perpendicular to line $$ \mathscr{M} $$.

Let's analyze the options:

- **Option A:** States that $$ \overleftrightarrow{K} $$ and $$ L \mathbb{M} $$ meet at a straight angle (180 degrees). However, perpendicularity implies a 90-degree angle, not a straight angle.
  
- **Option B:** Claims that $$ \overparen{JK} $$ and $$ \Sigma M $$ are coplanar and do not intersect. Perpendicular lines usually intersect unless they are skew lines in three-dimensional space, which doesn't align with the given information.
  
- **Option C:** Suggests that $$ \overparen{K} $$ and $$ LM $$ are not in the same plane. If two lines are not coplanar (i.e., they are skew lines), perpendicularity is not typically described in this context.
  
- **Option D:** States that $$ \overleftrightarrow{K} $$ and $$ \mathscr{M} $$ meet at a right angle (90 degrees), which aligns perfectly with the concept of perpendicularity.

**Therefore, the correct statement is:**

**D. $$ \overleftrightarrow{K} $$ and $$ \mathscr{M} $$ meet at a right angle.**
D. $$ \overleftrightarrow{K} $$ and $$ \mathscr{M} $$ meet at a right angle.

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