Interoperable interactive geometry for Europe
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This platform is brought to you by the intergeo project, funded under the eContent Plus programme of the European commission and by partners

Triangles - Medians and Right Triangles

User interacts with construction and notices that the triangle constructed under the given conditions "appears" to be a right triangle. He then uses standard 6th grade geometric facts to "prove" that the angle is in fact 90°. Understanding triangles, angles and logical conclusions. Pre-knowledge: The sum of the angles of a triangle is 180°, the sum of supplementary angles is 180° the angles at the base of an isosceles triangle are congruent (equal size).

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