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A Non-Convex Quadrilateral ABCD Tiles the Plane

Question 12

Multiple Choice

A non-convex quadrilateral ABCD tiles the plane. What is a possible configuration of the angles at the vertices?
I: two types of vertices: 2 As and 2 Cs; 2 Bs and 2 Ds
II: one type of vertex: A, B, C, D


A) I only
B) II only
C) both I and II
D) neither I nor II

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