Khan Academy
Khan Academy: Triangles: Area of Diagonal Triangles of Rectangle Are Equal
This video shows that the area of diagonal generated triangles of a rectangle are equal.
Khan Academy
Khan Academy: Triangles: Bhaskara's Proof of Pythagorean Theorem
An elegant visual proof of the Pythagorean Theorem developed by the 12th century Indian mathematician Bhaskara.
Khan Academy
Khan Academy: Triangles: Garfield's Proof of the Pythagorean Theorem
A video explaining how James Garfield's proved the Pythagorean Theorem.
Khan Academy
Khan Academy: Triangles: Another Pythagorean Theorem Proof
Students explore the Pythagorean Theorem by exploring a visual proof of the Theorem as they watch a video tutorial.
Sophia Learning
Sophia: Calculating the Area of a Triangle
This video lesson demonstrates how to calculate the area of a triangle. It includes detailed examples including ones that use the Pythagorean Theorem. Students can check their understanding with an assessment. [10:43]
Sophia Learning
Sophia: Calculating the Perimeter of a Triangle
This video lesson demonstrates how to find the perimeter of triangles. [3:42] The tutorial includes detailed examples. Students can check their understanding with an assessment.
Sophia Learning
Sophia: Categorizing Triangles With Congruency
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]
Sophia Learning
Sophia: Classifying Triangles
This video lesson describes and provides examples of right, acute, and obtuse triangles. Students can check their understanding with an assessment. [2:24]
Sophia Learning
Sophia: Classifying Triangles by Angle
This video lesson shows examples of classifying triangles by their angle measurements. Students can check their understanding with an assessment. [3:54]
Sophia Learning
Sophia: Congruent Triangles
Congruent triangles are explored in this video lesson. [1:54] The tutorial includes detailed examples and a short assessment.
Sophia Learning
Sophia: Converse of the Pythagorean Theorem
Use the Pythagorean theorem to determine if the triangle is a right triangle. Assess learning with a quiz.
Sophia Learning
Sophia: Introduction to Triangle Similarity
Similar Triangles are explored in this video lesson. Students can check their understanding with an assessment. [5:51]
Sophia Learning
Sophia: Isosceles Triangles
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]
Sophia Learning
Sophia: More Difficult Pythagorean Theorem Examples
Solve the Pythagorean theorem that contains radicals and assess learning with a quiz.
Sophia Learning
Sophia: Pythagorean Theorem and Right Triangles
Determine if the Pythagorean theorem can be used with triangles that are not right triangles. Assess learning with a quiz.
Sophia Learning
Sophia: Pythagorean Theorem Proof
Prove the Pythagorean theorem and take a quiz to assess learning.
Sophia Learning
Sophia: Quadrilaterals and Triangles
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.
Sophia Learning
Sophia: Quadrilaterals and Triangles
This video lesson [4:55] describes the characteristics that quadrilaterals and triangles have in common. Students can check their understanding with an assessment.
Sophia Learning
Sophia: Scalene, Isosceles, and Equilateral Triangles
This video lesson [2:10] shows examples for classifying triangles by their side lengths. Students can check their understanding with an assessment.
Sophia Learning
Sophia: Special Right Triangles
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'...
Sophia Learning
Sophia: Triangle Congruence Theorem (Hl)
This video lesson introduces and provides examples of the Hypotenuse-Leg Triangle Congruence Theorem. Students can check their understanding with an assessment.
Sophia Learning
Sophia: Triangle Height
In this video tutorial, explore how to determine the height of obtuse, acute, and right triangles. Take a quiz to assess learning. [6:15]
Sophia Learning
Sophia: Triangle Interior Angles Practice
Determine the value of a variable when solving for the interior angles of a triangle. Check understanding with a quiz.
Sophia Learning
Sophia: Angles of a Triangle
This video tutorial demonstrates how to find the interior and exterior angles of a triangle.