UNIT 1
... • Perpendicular lines are lines that intersect at right angles. • Parallel lines are two lines in a plane that never intersect or cross. • A line that intersects two or more other lines is called a transversal. • If the two lines cut by a transversal are parallel, then these special pairs of angles ...
... • Perpendicular lines are lines that intersect at right angles. • Parallel lines are two lines in a plane that never intersect or cross. • A line that intersects two or more other lines is called a transversal. • If the two lines cut by a transversal are parallel, then these special pairs of angles ...
6-3
... triangle are proportional to the corresponding sides of another triangle and the included angles are congruent, the the triangles are similar. ...
... triangle are proportional to the corresponding sides of another triangle and the included angles are congruent, the the triangles are similar. ...
Apollonian network
In combinatorial mathematics, an Apollonian network is an undirected graph formed by a process of recursively subdividing a triangle into three smaller triangles. Apollonian networks may equivalently be defined as the planar 3-trees, the maximal planar chordal graphs, the uniquely 4-colorable planar graphs, and the graphs of stacked polytopes. They are named after Apollonius of Perga, who studied a related circle-packing construction.