Correct

垂线

/ chuíxiàn / 
Strokes

Definition

(math.) perpendicular line/vertical line

Example

As a Noun

perpendicular; vertical; vertical/perpendicular line

1
Zhōng
中
chuí
垂
xiàn
线

perpendicular bisector

2
Huà
画
yī
一
tiáo
条
chuí
垂
xiàn
线

draw a perpendicular/vertical line