basic concepts of geometry
Using set squares
The 45º and 60º triangular set squares should be handled with care. Press on them lightly when drawing so they don't move.
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Perpendicular bisector
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Thales Theorem
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Angle bisector
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Copy an angle
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Add and subtract angles
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Copy a segment
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Add segments
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Multiply a segment by a real number
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Substract segments
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