66 Videos for "parallel lines"

Parallel and Skew Lines  Concept
Math › Precalculus › Equations of Lines, Parabolas and Circles
How to mark parallel lines, how to show lines are parallel, and how to compare skew and parallel lines. 
Converse of Parallel Lines Theorem  Concept
Math › Geometry › Reasoning, Diagonals, Angles and Parallel Lines
How to take the converse of the parallel lines theorem. 
Converse of Parallel Lines Theorem  Problem 2
Math › Geometry › Reasoning, Diagonals, Angles and Parallel Lines
How to solve for a variable to make lines parallel. 
Parallel Planes and Lines  Concept
Math › Precalculus › Equations of Lines, Parabolas and Circles
How to identify parallel lines, a line parallel to a plane, and two parallel planes. 
Converse of Parallel Lines Theorem  Problem 1
Math › Geometry › Reasoning, Diagonals, Angles and Parallel Lines
How to solve for a variable to make lines parallel. 
Parallel and Skew Lines  Concept
Math › Geometry › Geometry Building Blocks
How to mark parallel lines, how to show lines are parallel, and how to compare skew and parallel lines. 
Parallel Planes and Lines  Concept
Math › Geometry › Geometry Building Blocks
How to identify parallel lines, a line parallel to a plane, and two parallel planes. 
Converse of Parallel Lines Theorem  Problem 2
Math › Precalculus › Equations of Lines, Parabolas and Circles
How to solve for a variable to make lines parallel. 
Converse of Parallel Lines Theorem  Problem 1
Math › Precalculus › Equations of Lines, Parabolas and Circles
How to solve for a variable to make lines parallel. 
Converse of Parallel Lines Theorem  Concept
Math › Precalculus › Equations of Lines, Parabolas and Circles
How to take the converse of the parallel lines theorem. 
Perpendicular, Parallel and Skew Lines in Space  Concept
Math › Precalculus › Vectors and Parametric Equations
How to determine whether two lines in space are parallel or perpendicular. 
Perpendicular, Parallel and Skew Lines in Space  Problem 1
Math › Precalculus › Vectors and Parametric Equations
How to find the equation of a line parallel to and perpendicular to a given line in space. 
Proportional Segments Between Parallel Lines  Concept
Math › Geometry › Similarity
How to prove two triangles are similar using a line parallel to a base. 
Perpendicular, Parallel and Skew Lines in Space  Problem 2
Math › Precalculus › Vectors and Parametric Equations
How to determine whether two lines in space intersect, and if not, how to determine if they are parallel. 
Proportional Segments Between Parallel Lines  Problem 1
Math › Geometry › Similarity
How to find a missing length in a triangle cut by a line parallel to a base. 
Parallel and Perpendicular Lines  Concept
Math › Algebra › Linear Equations and Their Graphs
How to determine whether lines are parallel, perpendicular, or neither. 
Parallel and Perpendicular Lines  Problem 1
Math › Algebra › Linear Equations and Their Graphs
How to write the equation of a line parallel to a given line through a given point. 
Proportional Segments Between Parallel Lines  Problem 2
Math › Geometry › Similarity
How to find missing lengths created by two parallel lines passing through a triangle. 
Cyclic Quadrilaterals and Parallel Lines in Circles  Concept
Math › Geometry › Circles
How to prove that opposite angles in a cyclic quadrilateral are congruent; how to prove that parallel lines create congruent arcs in a circle. 
Constructing Parallel Lines  Problem 2
Math › Geometry › Constructions
How to construct parallel lines using alternate interior angles.