to cut something in half equally
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bisect
When you bisect something you divide it into two congruent (equal) pieces
Sure, you can divide a pentagon into 4 parts by drawing two diagonals from one vertex to the opposite vertex, creating four triangles inside the pentagon. So technically, yes, you can divide a pentagon into 4 parts. But good luck trying to fit them back together perfectly!
Infinite ways
CPCTC or congruent