• #### 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.
• #### Proportional Segments Between Parallel Lines - Problem 2

##### Math›Geometry›Similarity
How to find missing lengths created by two parallel lines passing through a triangle.
• #### The Vector Equation of a Line - Problem 3

##### Math›Precalculus›Vectors and Parametric Equations
How to write the vector equation of a line segment given its endpoints.
• #### Constructing the Perpendicular Bisector - Problem 2

##### Math›Geometry›Constructions
How to create a line segment that is 5/4 of a given segment.
• #### Calculating the Midpoint - Problem 2

##### Math›Geometry›Geometry Building Blocks
How to use the endpoints of a line segment and the midpoint formula to find the midpoint of the line segment.
• #### Trapezoid Midsegment Properties - Problem 2

##### Math›Geometry›Polygons
How to find the length of the segments that divide the sides of a triangle into three congruent segments.
• #### Constructing the Perpendicular Bisector - Problem 2

##### Math›Precalculus›Equations of Lines, Parabolas and Circles
How to create a line segment that is 5/4 of a given segment.
• #### Radii to Tangents - Problem 3

##### Math›Geometry›Circles
How to calculate the length of a segment drawn from the center of a circle to a point outside the circle, given the length of the tangent segment to that circle.
• #### Constructing a Median - Concept

##### Math›Geometry›Constructions
How to define a median in a triangle.
• #### Constructing a Triangle Midsegment - Problem 1

##### Math›Geometry›Constructions
How to construct a midsegment in a triangle.
• #### Secants - Problem 3

##### Math›Geometry›Circles
How to find the length of intersecting secant segments.
• #### Constructing a Median - Problem 1

##### Math›Geometry›Constructions
How to construct a median in a triangle.
• #### Constructing a Triangle Midsegment - Concept

##### Math›Geometry›Constructions
How to define a midsegment in a triangle.
• #### Polygons - Problem 1

##### Math›Geometry›Geometry Building Blocks
How to mark equiangular, equilateral, and regular polygons.
• #### Constructing Altitudes - Problem 2

##### Math›Geometry›Constructions
How to construct an altitude in an obtuse triangle.
• #### Distance Formula - Concept

##### Math›Trigonometry›Pythagorean Theorem
How to derive the equation for the distance between two points using the Pythagorean Theorem.
• #### Constructing the Centroid - Problem 1

##### Math›Geometry›Constructions
How to construct the centroid of a triangle.
• #### Distance Formula - Concept

##### Math›Geometry›Pythagorean Theorem
How to derive the equation for the distance between two points using the Pythagorean Theorem.
• #### Constructing Altitudes - Problem 1

##### Math›Geometry›Constructions
How to construct an altitude in an acute triangle.
• #### Constructing the Perpendicular Bisector - Problem 1

##### Math›Geometry›Constructions
How to draw a perpendicular bisector of a line segment using a compass and straightedge.