Tiles are often used for flooring because of the intricate patterns and tessellations that they can form. In this photo you can see examples of congruent triangles. You can tell that they are congruent because of the verticals angles and the fact that they are next to squares -- this arrangement shows the use of the SAS postulate to prove the triangles congruent. You could also use parallel lines and interior angles to use the ASA postulate. (~AL1)
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