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Similar triangles

Autore:Math Teachers' Adventure of ICT Integration, Judith Danter, Johanna Zöchbauer

Task

Move the points B and C and watch the interior angles and the sides of the triangle. Which connections can you find?

Which of the following statements are correct? Tick the right answers!

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A
If I move point B or C, the size of one angle changes.
B
If I move point C, only the angles in the second triangle change.
C
In similar triangles the angles are always equal.
D
The size of the angles in both triangles do not change, even if I change the length of the sides.

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