It is known that △ ABC is not in plane α. If the distances from a, B and C to plane α are equal, then the positional relationship between plane ABC and plane α is______ .

It is known that △ ABC is not in plane α. If the distances from a, B and C to plane α are equal, then the positional relationship between plane ABC and plane α is______ .

As shown in the figure: (1) when a, B and C are on the same side of plane α, the distance from them to plane α is equal, so plane ABC ‖ plane α; (2) when the midpoint D and e of AB and AC in △ ABC are in plane α, because BC ‖ De, so BC is parallel to plane α, so the distance from B and C to plane α is equal, let Aa1 ⊥