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Special trigonometric numbers: Explanation video
This video explains how the special trigonometric numbers can be derived.
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Similarity Features: Explanation Video
In this video an overview is given of the similarity characteristics of triangles.
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Similar triangles: Description
In this video the concept of similarity in triangles is defined.
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Metric Relations: Explanation Video
This video shows how to work with the properties of metric relations.
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Fourth proportional: Construction
This video explains how a line segment can be divided into 4 equal parts and how the construction for the 4th proportional can be applied.
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Similar triangles: Determine missing side
This video explains how the missing side of similar triangles can be determined, based on the characteristics of similar triangles
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Proportions: Fourth proportional and means proportional
This video explains how the fourth proportional and the means proportional are calculated in a proportionality.
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Issues of proportionality: Elaborated examples
In this video 2 issues on proportions are solved, one with a direct proportion and one with an inverse proportion.
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Proportions: Main property
In this video, 2 examples explain how a proportionality can be solved with the main property of proportionality.
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Reverse Proportionality: Explanation Video
In this video the concept of inverse proportion is explained from an example.
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Proportionality: Explanation Video
In this video the concept of proportionality is explained from an example.
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Congruence characteristics triangle: Overview
A video that gives an overview of the congruence characteristics of triangles.
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