0 of two or more geometrical figures, touching at all points when one is fitted on top of the other -- kongruen
congruent triangles.
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Kita boleh melengkapkannya selangkah demi selangkah walau bagaimanapun panjang jalan dan ia tidak boleh disiapkan walau sependek jalan pun jika anda tidak menandai tapak kaki anda.