Geometry Glossary - B
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base angles of an isosceles triangle:	The angles of an isosceles triangle opposite the legs or congruent sides.
base of an isosceles triangle:	The side opposite the vertex angle in an isosceles triangle.
bases of a prism:	Two congruent polygonal faces that lie in parallel planes.
bisector of a segment:	A line, ray, segment, or plane that intersects a segment at its midpoint.

Note: The terms in this collection may not be entirely accurate.
They are for reference only.

base angles of an isosceles triangle: