• #### Parallel and Perpendicular Lines - Problem 8

##### Math›Algebra›Linear Equations and Their Graphs
Determining whether two lines are parallel from their equations
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• #### Parallel and Perpendicular Lines - Problem 7

##### Math›Algebra›Linear Equations and Their Graphs
Write the equation for a line parallel to a given line through a given slope in point slope and then slope intercept form, including fractional slopes
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• #### Parallel and Perpendicular Lines - Problem 9

##### Math›Algebra›Linear Equations and Their Graphs
Write the equation for a line parallel to a given line through a given slope in point slope and then slope intercept form with integer slope
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• #### 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.
• #### Vectors and Planes - Concept

##### Math›Precalculus›Vectors and Parametric Equations
How to find a vector normal (perpendicular) to a plane given an equation for the plane.
• #### Chords and a Circle's Center - Concept

##### Math›Geometry›Circles
How to define a chord; how to describe the effect of a perpendicular bisector of a chord and the distance from the center of the circle.
• #### Chords and a Circle's Center - Problem 1

##### Math›Geometry›Circles
How to find the length of two chords where the length of the perpendicular bisectors are given.
• #### Components of a Force - Problem 2

##### Math›Precalculus›Vectors and Parametric Equations
How to find the components of the weight of a block parallel to and perpendicular to the surface of an inclined plane.
• #### The Angle Between Vectors - Problem 2

##### Math›Precalculus›Vectors and Parametric Equations
How to determine whether two vectors are perpendicular or parallel.
• #### The Angle Between Planes - Problem 1

##### Math›Precalculus›Vectors and Parametric Equations
How to determine if two planes are parallel or perpendicular.
• #### The Angle Between Planes - Problem 3

##### Math›Precalculus›Vectors and Parametric Equations
How to find an equation of a plane parallel to or perpendicular to a given plane.
• #### The Angle Between Planes - Concept

##### Math›Precalculus›Vectors and Parametric Equations
How to find the angle between planes, and how to determine if two planes are parallel or perpendicular.
• #### The Cross Product of Vectors - Problem 2

##### Math›Precalculus›Systems of Linear Equations and Matrices
How to show that the cross product of vectors u and v is perpendicular to both u and v.
• #### Vector Operations in 3D - Problem 1

##### Math›Precalculus›Vectors and Parametric Equations
How to find the angle between two vectors in 3D, and how to tell whether two vectors are parallel or perpendicular.
• #### Transverse Waves

##### Science›Physics›Vibration and Waves
Understanding transverse waves.
• #### Components of a Force - Concept

##### Math›Precalculus›Vectors and Parametric Equations
How to define the components of a vector.
• #### Constructing the Circumcenter - Concept

##### Math›Geometry›Constructions
How to construct the circumcenter using a compass and straightedge.
• #### Kite Properties - Concept

##### Math›Geometry›Polygons
How to identify a kite and its special properties.
• #### Radii to Tangents - Concept

##### Math›Geometry›Circles
How to define a tangent line; how to determine the angle a radius to a tangent forms.
• #### Constructing Altitudes - Problem 2

##### Math›Geometry›Constructions
How to construct an altitude in an obtuse triangle.