What is an isosceles triangle? You should know...

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How to solve isosceles triangle problems in geometry.

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Euclid defined an isosceles triangle as a triangle with exactly two equal sides, but modern treatments prefer to define isosceles triangles as having at least two equal sides. The difference between these two definitions is that the modern version makes equilateral triangles (with three equal sides) a special case of isosceles triangles.

Why is your video based on an old fashioned definition of this type of triangle?

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