这就等于一个单位圆的面积。

Well, it's just the area of a unit circle.

youdao

一个平面物体的密度是每单位面积元的质量。

The density for a flat object would be the mass per unit area.

youdao

面积的单位是一个长度乘以另一个长度的积。

The unit of area is a product of a length times a length.

youdao

面积的单位是一个长度乘以另一个长度的积。

The unit of area is a product of a length times a length.

youdao