Geometry Triangle Proofs and Theorems

Let's explore the difference between similar and congruent figures (similarity vs. congruence) in this conceptual mini-lesson. ★ Want more FREE weekly math videos? Subscribe Now: ★★ Why Math? Download YOUR Free eBook and sign-up for our FREE weekly newsletter: ★★★ Learn More About Anthony: Understand congruence and similarity using physical models, transparencies, or geometry software. Understand that a two-dimensional figure is similar to another if the second can be obtained from the first by a sequence of rotations, reflections, translations, and dilations; given two similar two-dimensional figures, describe a sequence that exhibits the similarity between them. What does it mean when two figures are similar? What does it mean when two figures are congruent? What is the difference between similarity and conrguence? Image Credit: Emojis provided free by ✔✔✔SUBSCRIBE FOR FREE: ✔✔JOIN OUR MAILING LIST: ✔FOLLOW US ON TWITTER: ✔FOLLOW US ON INSTAGRAM: ✔FOLLOW US ON PINTEREST: ✔LIKE US ON

Let's explore the difference between similar and congruent figures (similarity vs. congruence) in this conceptual mini-lesson. ★ Want more FREE weekly math videos? Subscribe Now: ★★ Why Math? Download YOUR Free eBook and sign-up for our FREE weekly newsletter: ★★★ Learn More About Anthony: Understand congruence and similarity using physical models, transparencies, or geometry software. Understand that a two-dimensional figure is similar to another if the second can be obtained from the first by a sequence of rotations, reflections, translations, and dilations; given two similar two-dimensional figures, describe a sequence that exhibits the similarity between them. What does it mean when two figures are similar? What does it mean when two figures are congruent? What is the difference between similarity and conrguence? Image Credit: Emojis provided free by ✔✔✔SUBSCRIBE FOR FREE: ✔✔JOIN OUR MAILING LIST: ✔FOLLOW US ON TWITTER: ✔FOLLOW US ON INSTAGRAM: ✔FOLLOW US ON PINTEREST: ✔LIKE US ON

Join us on this lesson where you will explore the properties of isosceles triangles and the isosceles triangle theorems including the base angles theorem. This lesson answers the questions: What is an isosceles triangle? What is the base angle theorem? What is the relationship between the sides and angles of an isosceles triangle? How can I prove that a triangle is isosceles? Our lessons are perfect for flipped classroom math teachers and students. This lesson is aligned with the common core learning standards for math and the SAT math curriculum as well. Be sure to join our mailing list at

Join us on this lesson where you will explore the properties of isosceles triangles and the isosceles triangle theorems including the base angles theorem. This lesson answers the questions: What is an isosceles triangle? What is the base angle theorem? What is the relationship between the sides and angles of an isosceles triangle? How can I prove that a triangle is isosceles? Our lessons are perfect for flipped classroom math teachers and students. This lesson is aligned with the common core learning standards for math and the SAT math curriculum as well. Be sure to join our mailing list at

On this triangle congruence lesson, you will learn the difference between the Angle-Angle-Side AAS theorem and the Angle-Side-Angle ASA theorem (also known as the asa postulate) when proving triangle congruence and what are same side interior angles? This lesson answers the questions: How do I prove that two triangles are congruent? What is ASA? What is AAS? What is the difference between ASA and AAS? Our lessons are perfect for flipped classroom math teachers and students. This lesson is aligned with the common core learning standards for math and the SAT math curriculum as well. Be sure to join our mailing list at

On this triangle congruence lesson, you will learn the difference between the Angle-Angle-Side AAS theorem and the Angle-Side-Angle ASA theorem (also known as the asa postulate) when proving triangle congruence and what are same side interior angles? This lesson answers the questions: How do I prove that two triangles are congruent? What is ASA? What is AAS? What is the difference between ASA and AAS? Our lessons are perfect for flipped classroom math teachers and students. This lesson is aligned with the common core learning standards for math and the SAT math curriculum as well. Be sure to join our mailing list at

Join us as we explore why Side-Side-Angle and Angle-Side-Side cannot be used to prove triangle congruence. For more MashUp Math content, visit and join our free mailing list! :) This lesson answers the questions: How do I prove that two triangles are congruent? Why can't SSA be used to prove that two triangles are congruent? Our lessons are perfect for flipped classroom math teachers and students. This lesson is aligned with the common core learning standards for math and the SAT math curriculum as well. Be sure to join our mailing list at

Join us as we explore why Side-Side-Angle and Angle-Side-Side cannot be used to prove triangle congruence. For more MashUp Math content, visit and join our free mailing list! :) This lesson answers the questions: How do I prove that two triangles are congruent? Why can't SSA be used to prove that two triangles are congruent? Our lessons are perfect for flipped classroom math teachers and students. This lesson is aligned with the common core learning standards for math and the SAT math curriculum as well. Be sure to join our mailing list at

Join us as we explore the five triangle congruence theorems (SSS postulate, SAS postulate, ASA postulate, AAS postulate, and HL postulate). By the end of this lesson, you will be able to identify each theorem and understand which scenarios they can be applied in. (hypotenuse leg, angle angle side, angle side angle, side angle side, side side side) Oh yeah, and you'll learn to avoid the donkey theorem :) For more MashUp Math content, visit and join our free mailing list! :) This lesson answers the questions: How do I prove that two triangles are congruent? What are the triangle congruence theorems? What is SSS? What is SAS? What is ASA? What is AAS? What is HL? How do I prove triangles using hypotenuse leg? Be sure to join our mailing list at

Join us as we explore the five triangle congruence theorems (SSS postulate, SAS postulate, ASA postulate, AAS postulate, and HL postulate). By the end of this lesson, you will be able to identify each theorem and understand which scenarios they can be applied in. (hypotenuse leg, angle angle side, angle side angle, side angle side, side side side) Oh yeah, and you'll learn to avoid the donkey theorem :) For more MashUp Math content, visit and join our free mailing list! :) This lesson answers the questions: How do I prove that two triangles are congruent? What are the triangle congruence theorems? What is SSS? What is SAS? What is ASA? What is AAS? What is HL? How do I prove triangles using hypotenuse leg? Be sure to join our mailing list at