• #### CPCTC - Concept

##### Math›Geometry›Triangles
How to use the principle that corresponding parts of congruent triangles are congruent, or CPCTC.
• #### Two Column Proofs - Problem 1

##### Math›Geometry›Triangles
How to use a two column proof to show that two triangles are congruent.
• #### Two Column Proofs - Problem 4

##### Math›Geometry›Triangles
How to use a two column proof to show that two sides are congruent with overlapping triangles.
• #### Two Column Proofs - Problem 3

##### Math›Geometry›Triangles
How to use a two column proof to show that two angles are congruent with overlapping triangles.
• #### Two Column Proofs - Problem 2

##### Math›Geometry›Triangles
How to use a two column proof to show that two angles are congruent in a parallelogram with one diagonal.
• #### HL - Problem 3

##### Math›Geometry›Triangles
How to solve for a variable to make two right triangles congruent using the HL shortcut.
• #### SSS and SAS - Problem 4

##### Math›Geometry›Triangles
How to use SAS and SSS to determine which triangles are congruent and correctly denote the congruence.
• #### SSS and SAS - Problem 3

##### Math›Geometry›Triangles
How to determine if two triangles are congruent by either SSS or SAS.
• #### Two Column Proofs - Concept

##### Math›Geometry›Triangles
How to organize a two column proof.
• #### Why SSA and AAA Don't Work as Congruence Shortcuts - Concept

##### Math›Geometry›Triangles
How to determine which congruence shortcuts do not work and why.
• #### Similar Triangles - Concept

##### Math›Pre-Algebra›Introductory Geometry
Overview of similarity: congruent angles, proportional corresponding sides
Tags:
• #### Flowchart Proofs - Problem 1

##### Math›Geometry›Triangles
How to prove that two segments are congruent in a trapezoid with diagonals.
• #### Center and Apothem of Regular Polygons - Concept

##### Math›Geometry›Area
How to define the apothem and center of a polygon; how to divide a regular polygon into congruent triangles.
• #### Inscribed Angles - Problem 2

##### Math›Geometry›Circles
How to find the measure of intercepted arcs, given the vertex angle of an inscribed isosceles triangle.
• #### Equiangular Polygon Sums - Concept

##### Math›Geometry›Polygons
How to find the measure of one angle in any equiangular or regular polygon.
• #### Equiangular Polygon Sums - Problem 1

##### Math›Geometry›Polygons
How to find the measure of one angle in a regular nonagon.
• #### Equiangular Polygon Sums - Problem 2

##### Math›Geometry›Polygons
How to find the number of sides in an equiangular polygon given the measure of one angle.
• #### Equiangular Polygon Sums - Problem 3

##### Math›Geometry›Polygons
How to find the measure of angles in regular polygons that share sides.
• #### Duplicating a Line Segment - Problem 2

##### Math›Geometry›Constructions
How to construct a triangle given three line segments.
• #### Duplicating a Line Segment - Problem 3

##### Math›Geometry›Constructions
How to construct an equilateral triangle given one segment.