In this video tutorial, triangles are classified as isosceles, equilateral, and scalene by the congruency of their sides. Assess learning with a quiz. [1:52]

This video lesson describes and provides examples of right, acute, and obtuse triangles. Students can check their understanding with an assessment. [2:24]

This video lesson shows examples of classifying triangles by their angle measurements. Students can check their understanding with an assessment. [3:54]

Congruent triangles are explored in this video lesson. [1:54] The tutorial includes detailed examples and a short assessment.

Use the Pythagorean theorem to determine if the triangle is a right triangle. Assess learning with a quiz.

Similar Triangles are explored in this video lesson. Students can check their understanding with an assessment. [5:51]

Isosceles triangles are explored in this video tutorial. The lesson models the parts of an isosceles triangle and describes how to find missing angle measures. [5:06]

Solve the Pythagorean theorem that contains radicals and assess learning with a quiz.

Determine if the Pythagorean theorem can be used with triangles that are not right triangles. Assess learning with a quiz.

Prove the Pythagorean theorem and take a quiz to assess learning.

In this video tutorial [4:17], students will explore the attributes that triangles and quadrilaterals have and how they share certain properties. Assess learning with a quiz.

This video lesson [4:55] describes the characteristics that quadrilaterals and triangles have in common. Students can check their understanding with an assessment.

This video lesson [2:10] shows examples for classifying triangles by their side lengths. Students can check their understanding with an assessment.

Special right triangles are investigated in this video tutorial. The lesson provides background knowledge and two videos that show the relationships of the sides in special right triangles and practice problems to test students'...

This video lesson introduces and provides examples of the Hypotenuse-Leg Triangle Congruence Theorem. Students can check their understanding with an assessment.

In this video tutorial, explore how to determine the height of obtuse, acute, and right triangles. Take a quiz to assess learning. [6:15]

Determine the value of a variable when solving for the interior angles of a triangle. Check understanding with a quiz.

This video tutorial demonstrates how to find the interior and exterior angles of a triangle.

Video proving that the sum of the measures of the angles in a triangle are 180.

Equilateral triangles are explored in this learning tutorial, which includes several videos [4:18; 4:18; 3:18] and a PowerPoint presentation. The lesson includes an introduction of equilateral triangles and their key characteristics....

Explains what it means for two triangles to be similar. Diagram of similar triangles is created with two parallel lines cut by two transversals.

Explains how to identify and use similar triangles in order to determine unknown side lengths in two given diagrams.

Gain a basic understanding of triangles by watching easy to understand video tutorial. Additional resources are available as part of a paid subscription service. [7:39]

Easy to follow video tutorial gives the formula for the Law of Cosines and uses it to find the missing side length of a triangle. [5:05]