Which term describes lines that intersect at a $$ 90^{\circ} $$ angle? A. Parallel B. Complementary C. Vertical D. Perpendicular

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The correct answer is:

**D. Perpendicular**

**Explanation:**
- **Parallel** lines run in the same direction and never meet, regardless of how far they are extended.
- **Complementary** refers to angles that add up to 90°, not the lines themselves.
- **Vertical** lines are lines that run straight up and down, perpendicular to the horizontal axis, but the term specifically describing lines that intersect at a 90° angle is different.
- **Perpendicular** lines intersect at a right angle (90°).

Therefore, lines that intersect at a $$ 90^{\circ} $$ angle are called **perpendicular**.
The term that describes lines intersecting at a $$ 90^{\circ} $$ angle is **perpendicular**.

Which term describes lines that intersect at a \( 90^{\circ} \) angle? A. Parallel B. Complementary C. Vertical D. Perpendicular

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