If any two sides of a triangle are equal in length to two sides of another triangle and the angles between each pair of sides have the same measure, then the two triangles are congruent. AKA the triangles are exactly the same size. (SAS stands for Side Angle Side.)
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AAA stands for angle-angle-angle SAS stands for side-angle-side and so forth
A graph or a number line or maybe some shapes
Not sure about a name, but "an infinite surface with zero curvature" is an equivalent phrase.
Plato's contribution to geometry was talking about how geometrical diagrams were imperfect imitations of the perfect mathematical objects that they represent. He felt that mathematics provided the perfect training for the mind.
Since this sentence is lacking a predicate, it is virtually impossible to answer. "Geometry words that start with r" is a legitimate noun phrase, but is so incomplete that it cannot be answered.