List of publications on a keyword: «фигуры равной ширины»
Lebedeva Svetlana Viktorovna , учитель математики
MBEI "Gymnasium №3" , Астраханская обл
«Investigation of properties of geometric objects with the same width»
The present article describes the results of investigaton held with the help of imaginary realized by authors interactive material model. With the help of it they detected that circle and Reuleaux triangle are the figures of equal width; the investigators also calculated their area and perimeter of these figures and developed 3 new demonstrations of Barbier's theorem.