Triangles

Never feel confused in Triangles class again! Our short 5-minute videos explain complicated Triangles concepts in a manner that's easy for you to understand. Additionally, transcripts and captions are available for your convenience. Every one of the lessons is followed by a quiz to make sure you've got the Triangles topics figured out.

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Triangles Video Lessons

Watch simple explanations of Triangles and related concepts. Browse through all study tools.

How to Find the Area of a Triangle: Lesson for Kids
How to Find the Area of a Triangle: Lesson for Kids
Measuring the Angles of Triangles: 180 Degrees
Measuring the Angles of Triangles: 180 Degrees
Congruency of Right Triangles: Definition of LA and LL Theorems
Congruency of Right Triangles: Definition of LA and LL Theorems
How to Identify Similar Triangles
How to Identify Similar Triangles
30-60-90 Triangle: Theorem, Properties & Formula
30-60-90 Triangle: Theorem, Properties & Formula
Similar Polygons: Definition and Examples
Similar Polygons: Definition and Examples
Triangle Lesson for Kids: Definition & Facts
Triangle Lesson for Kids: Definition & Facts
Using Sine to Find the Area of a Triangle
Using Sine to Find the Area of a Triangle
Properties of Congruent & Similar Solids
Properties of Congruent & Similar Solids
Congruency of Isosceles Triangles: Proving the Theorem
Congruency of Isosceles Triangles: Proving the Theorem
The HA (Hypotenuse Angle) Theorem: Proof, Explanation, & Examples
The HA (Hypotenuse Angle) Theorem: Proof, Explanation, & Examples
Identifying Parallel Lines in Geometric Shapes
Identifying Parallel Lines in Geometric Shapes
Vertex Angle of an Isosceles Triangle
Vertex Angle of an Isosceles Triangle
Similarity Transformations in Corresponding Figures
Similarity Transformations in Corresponding Figures
Explaining the Pythagorean Theorem with Models & Diagrams
Explaining the Pythagorean Theorem with Models & Diagrams
Congruence in Geometric Shapes
Congruence in Geometric Shapes
Angles and Triangles: Practice Problems
Angles and Triangles: Practice Problems
Congruent in Math: Definition & Examples
Congruent in Math: Definition & Examples
The HL (Hypotenuse Leg) Theorem: Definition, Proof, & Examples
The HL (Hypotenuse Leg) Theorem: Definition, Proof, & Examples
What is a Scalene Triangle? - Definition, Properties & Examples
What is a Scalene Triangle? - Definition, Properties & Examples
Proportional Relationships in Triangles
Proportional Relationships in Triangles
Properties of Right Triangles: Theorems & Proofs
Properties of Right Triangles: Theorems & Proofs
What Are Congruent Figures? - Definition & Examples
What Are Congruent Figures? - Definition & Examples
Right Triangle Altitudes: Applications
Right Triangle Altitudes: Applications
Constructing Similar Polygons
Constructing Similar Polygons
Side-Angle-Side (SAS) Triangle: Definition, Theorem & Formula
Side-Angle-Side (SAS) Triangle: Definition, Theorem & Formula
Triangles: Definition and Properties
Triangles: Definition and Properties
Applications of Similar Triangles
Applications of Similar Triangles
45-45-90 Triangle: Theorem, Rules & Formula
45-45-90 Triangle: Theorem, Rules & Formula
Similarity in Geometric Shapes
Similarity in Geometric Shapes
Finding Distance with the Pythagorean Theorem
Finding Distance with the Pythagorean Theorem
Congruence Proofs: Corresponding Parts of Congruent Triangles
Congruence Proofs: Corresponding Parts of Congruent Triangles
How to Find the Altitude of a Triangle
How to Find the Altitude of a Triangle
Congruent Segments: Definition & Examples
Congruent Segments: Definition & Examples
How to Find the Area of an Isosceles Triangle
How to Find the Area of an Isosceles Triangle
Hypotenuse: Definition & Formula
Hypotenuse: Definition & Formula
Congruent Angles: Definition & Examples
Congruent Angles: Definition & Examples
Similar Figures: Definition & Examples
Similar Figures: Definition & Examples
The Pythagorean Theorem: Practice and Application
The Pythagorean Theorem: Practice and Application
Triangle Congruence Postulates: SAS, ASA & SSS
Triangle Congruence Postulates: SAS, ASA & SSS
The Transitive Property of Similar Triangles
The Transitive Property of Similar Triangles
Median of a Triangle: Definition & Formula
Median of a Triangle: Definition & Formula
Triangles in Coordinate Planes & Proofs
Triangles in Coordinate Planes & Proofs
Applying Scale Factors to Perimeter, Area, and Volume of Similar Figures
Applying Scale Factors to Perimeter, Area, and Volume of Similar Figures
Shapes with Right Angles
Shapes with Right Angles
How to Find the Circumradius of a Triangle
How to Find the Circumradius of a Triangle
What Are Triangular Numbers? - Definition, Formula & Examples
What Are Triangular Numbers? - Definition, Formula & Examples
How to Find the Hypotenuse of a Right Triangle Using the Pythagorean Theorem
How to Find the Hypotenuse of a Right Triangle Using the Pythagorean Theorem
Special Right Triangles: Types and Properties
Special Right Triangles: Types and Properties
How to Find the Height of a Triangle
How to Find the Height of a Triangle
How to Find the Area of an Equilateral Triangle
How to Find the Area of an Equilateral Triangle
Special Triangle: Rules & Formulas
Special Triangle: Rules & Formulas
Congruent Sides of a Triangle: Definition & Overview
Congruent Sides of a Triangle: Definition & Overview
How to Find Shorter Sides on a Right Triangle Using the Pythagorean Theorem
How to Find Shorter Sides on a Right Triangle Using the Pythagorean Theorem
Properties of Congruent and Similar Shapes
Properties of Congruent and Similar Shapes
Constructing Inscribed & Circumscribed Triangles
Constructing Inscribed & Circumscribed Triangles
Similar Triangles & the AA Criterion
Similar Triangles & the AA Criterion
The Pythagorean Theorem: Converse and Special Cases
The Pythagorean Theorem: Converse and Special Cases
Orthocenter in Geometry: Definition & Properties
Orthocenter in Geometry: Definition & Properties
What is an Isosceles Triangle? - Definition, Properties & Theorem
What is an Isosceles Triangle? - Definition, Properties & Theorem
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