Correct

外圆

/ wài yuán / 
Strokes

Example

As a Noun

excircle

1
Wài
外
yuán
圆
xǐdāo
铣刀

cylindrical milling cutter

2
Wài
外
yuán
圆
móchuáng
磨床

cylindrical/external grinding machine

3
Wài
外
yuán
圆
chēxiāo
车削

external cutting

4
Wàiyuán
外圆
chēdāo
车刀

bullnose tool