• #### Parallel and Perpendicular Lines - Problem 3

##### Math›Algebra›Linear Equations and Their Graphs
How to write the equation of a line perpendicular to a given line that is not in slope intercept form.
• #### 45-45-90 Triangles - Problem 2

##### Math›Geometry›Pythagorean Theorem
How to find the length of a leg in a 45-45-90 given the hypotenuse.
• #### 45-45-90 Triangles - Concept

##### Math›Geometry›Pythagorean Theorem
How to find the length of a leg or hypotenuse in a 45-45-90 triangle using the Pythagorean Theorem.
• #### One-Sided Limits - Concept

##### Math›Calculus›Limits and Continuity
How to use one-sided limits to show that a limit does not exist.
• #### 30-60-90 Triangles - Problem 1

##### Math›Geometry›Pythagorean Theorem
How to find the long leg and short leg in a 30-60-90 triangle given the hypotenuse.

• #### We the People Kind Of

##### Test Prep›AP US History›AP US History Videos
Explore the reasons behind the Constitution and the framework of the U.S. government.
• #### Limits: A Graphical Approach - Concept

##### Math›Calculus›Limits and Continuity
How to determine one-sided and two-sided limits from the graph of a function.
• #### 45-45-90 Triangles - Problem 1

##### Math›Geometry›Pythagorean Theorem
How to find the hypotenuse in a 45-45-90 triangle given a leg with a length that contains a square root.
• #### Parallel and Perpendicular Lines - Problem 2

##### Math›Algebra›Linear Equations and Their Graphs
How to write the equation of a line perpendicular to a given line through a given point.
• #### 45-45-90 Triangles - Problem 3

##### Math›Trigonometry›Pythagorean Theorem
How to find the perimeter of a square given the length of its diagonal using 45-45-90 triangles.
• #### One-Sided Limits - Problem 3

##### Math›Calculus›Limits and Continuity
How to find a two-sided limit by investigating one-sided limits.
• #### Infinite Limits; Vertical Asymptotes - Concept

##### Math›Calculus›Limits and Continuity
How to use one-sided limits to find a vertical asymptote.
• #### Using the Pythagorean Theorem to find a Missing Leg - Problem 1

##### Math›Geometry›Pythagorean Theorem
How to use the Pythagorean Theorem to find a missing leg, given the length of the hypotenuse and a leg.
• #### Using the Pythagorean Theorem to find a Missing Leg - Problem 1

##### Math›Trigonometry›Pythagorean Theorem
How to use the Pythagorean Theorem to find a missing leg, given the length of the hypotenuse and a leg.
• #### Using the Pythagorean Theorem to find a Missing Leg - Concept

##### Math›Geometry›Pythagorean Theorem
How to use the Pythagorean Theorem to find a missing leg, given the length of the hypotenuse and a leg.
• #### Using the Pythagorean Theorem to find a Missing Leg - Concept

##### Math›Trigonometry›Pythagorean Theorem
How to use the Pythagorean Theorem to find a missing leg, given the length of the hypotenuse and a leg.
• #### 45-45-90 Triangles - Problem 3

##### Math›Geometry›Pythagorean Theorem
How to find the perimeter of a square given the length of its diagonal using 45-45-90 triangles.
• #### Limits: A Graphical Approach - Problem 1

##### Math›Calculus›Limits and Continuity
How to determine one-sided and two-sided limits from the graph of a function.
• #### Limits: A Graphical Approach - Problem 2

##### Math›Calculus›Limits and Continuity
How to determine limits from the graph of a function and the difference between the limit and value of a function.