radius|radii

这个圆的半径是5厘米。

The ___radius of this circle is 5 centimeters.

这个自行车轮有12根辐条均匀分布在轮毂周围。

This bicycle wheel has 12 ___radii evenly spaced around the hub.

医生在X光片上确认她的桡骨骨折了。

The doctor confirmed her ___radius was fractured on the X-ray.