1.
altitude: is a perpendicular segment with one endpoint at a vertex and the other endpoint on the side oppisite that vertex.
2.
angle: a figure formed by two noncolinear rays that have a common endpoint and are not opposite rays.
3.
angle bisector: a segment that seperates on angle of a triangle into two coungruent angles.
4.
base: the side opposite the vertex angle
5.
centroid: the point of intersection of the three medians of a triangle.
6.
concurrent: three or more lines that intersect at a common point.
7.
congruent triangles: triangles whose corresponding parts are congruent.
8.
distance formula: d = √[( x₂ - x₁)² + (y₂ - y₁)²]
9.
hypotenuse: the side of a right triangle opposite the right angle.
10.
legs of a right triangle: the two sides that form the right angle
11.
legs of an isosceles triangle: The congruent sides of the isosceles triangle
12.
line: a basic undefined term of geometery, which extend indifently and have no thickness or width.
13.
median: a segment in which one edpoint is the vertex of a triangle and the other endpoint of the side opposite that vertex.
14.
parallel lines: lines in the same plane that never intersect
15.
perpendicular bisector: A line that is perpendicular to a segment at its midpoint.
16.
perpendicular lines: Two lines that intersect to form right angles
17.
point: a basic undefined term of geometery that have no size.
18.
pythagorean theory: a2 + b2 = c2
19.
pythagorean triple: a set of three whole numbers that work in the pythagorean theorem
20.
ray: A part of a line, with one endpoint, that continues without end in one direction
21.
segment: the part of a line consisting of two endpoints and all points between them
