Triangle side lengths
8 videos
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Basic geometry and measurement - Triangle Inequality Theorem
Learn the triangle inequality theorem: any side must be less than the sum of the other two. Includes examples showing which side lengths can form valid triangles.
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Basic geometry and measurement - Finding the Range of a Triangle's Third Side
Learn how to find the possible length of a triangle's third side using the triangle inequality theorem. The third side must be between the difference and sum of the other two sides.
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Basic geometry and measurement - Intro to the Pythagorean Theorem
Learn the Pythagorean theorem: a² + b² = c². Understand right triangles and how to calculate the hypotenuse using real number examples.
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Basic geometry and measurement - Finding a Missing Side with the Pythagorean Theorem
Learn how to use the Pythagorean theorem to find a missing side of a right triangle. Step-by-step example shows solving for a leg when given the hypotenuse.
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Basic geometry and measurement - Pythagorean Theorem with Isosceles Triangles
Learn how to find the height of an isosceles triangle using the Pythagorean theorem by dropping an altitude to split it into two right triangles.
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Basic geometry and measurement - Pythagorean Theorem Word Problems
Learn how to use the Pythagorean theorem to solve a real-world problem: finding the height of a kite using string length and ground distance.
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Basic geometry and measurement - Pythagorean Theorem in 3D
Learn how to find the space diagonal of a 3D box using the Pythagorean theorem twice. Applies the formula: diagonal² = length² + width² + height².
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Basic geometry and measurement - Distance Between Two Points
Learn how to calculate distance between two points using the Pythagorean theorem. A practical example shows how the distance formula works on a coordinate plane.