In space, it is shared with the plane whose distance from the three vertices of △ ABC is 1cm______ .

In space, it is shared with the plane whose distance from the three vertices of △ ABC is 1cm______ .

If the triangle is on the same side of the plane, there are two planes which are 1cm away from the three vertices of △ ABC. Because the side length of the regular triangle is 3, the height of the triangle is 332 > 2. So when the plane passes through the median line EF, according to the property of line plane parallel, there are two planes to the three vertices of △ ABC