• #### Constructing an Angle Bisector - Problem 2

##### Math›Geometry›Constructions
How to construct a 45 degree angle.
• #### Instantaneous Velocity

##### Science›Physics›Linear and Projectile Motion
How to find instantaneous velocity.
• #### Focus and Directrix of a Parabola - Problem 1

##### Math›Algebra 2›Quadratic Equations and Inequalities
How to find the equation of a parabola given the focus and directrix.
• #### Adding and Subtracting Rational Expressions - Problem 9

##### Math›Algebra 2›Rational Expressions and Functions
Distance equals rate times time as boat in current problem.
Tags:
• #### Introduction to the 3D Coordinate System - Concept

##### Math›Precalculus›Vectors and Parametric Equations
How to define the components and length of a position vector in three dimensions.
• #### Introduction to the 3D Coordinate System - Problem 1

##### Math›Precalculus›Vectors and Parametric Equations
How to find the coordinates of the vertices of a rectangular box.
• #### Locus and Definition of a Circle and Sphere - Problem 2

##### Math›Geometry›Circles
How to find the locus of points that are equidistant from the sides of an angle.
• #### Locus and Definition of a Circle and Sphere - Problem 1

##### Math›Geometry›Circles
How to find the locus of points that are equidistant from the endpoints of a segment.
• #### Lines in Polar Coordinates - Problem 1

##### Math›Precalculus›Polar Coordinates and Complex Numbers
How to find the polar equation of any line.
• #### Lines in Polar Coordinates - Problem 2

##### Math›Precalculus›Polar Coordinates and Complex Numbers
How to interpret the polar equation of a line.
• #### Lines in Polar Coordinates - Problem 3

##### Math›Precalculus›Polar Coordinates and Complex Numbers
How to find equations of a line tangent to a circle in polar and rectangular coordinates.
• #### Introduction to the 3D Coordinate System - Problem 3

##### Math›Precalculus›Vectors and Parametric Equations
How to find the components of a vector from point A to point B in three-dimensions, and how to find its length.