The interior angle of a hexagon is 120 ∘, 120 ∘, and the sum of three interior angles is 360 ∘. There are three hexagons meeting at each vertex. In Figure 10.79, the tessellation is made up of regular hexagons. An interior angle of a square is 90 ∘ 90 ∘ and the sum of four interior angles is 360 ∘. There are four squares meeting at a vertex. In Figure 10.78, the tessellation is made up of squares.
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