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A stub about a geometric theorem which I will expand
The '''Isosceles Triangle Theorem''' is a [[theorem]] stating that if two sides of a [[triangle]] are equal, the two [[angle|angles]] of that triangle which include the third side are equal as well. This is proven by bisecting the angle between the equal sides to form two new triangles which are congruent by SAS congruency. By CPCTE, the two aforementioned angles are equal.<ref>''Beauty, Rigor, Surprise''</ref>
==References==
{{reflist}}
[[Category:Geometry]]
==References==
{{reflist}}
[[Category:Geometry]]