Let
Michael made a cube with edge
Peter went to the Museum of Modern Art and saw a square painting in a frame of an unusual shape. The frame consisted of
Let
Consider the 7 different tetrominoes. Is it possible to cover a
We allow rotation of the tetrominoes, but not reflection. This means that we consider
Let
A paper band of constant width is tied into a simple knot and tightened. Prove that the knot has the shape of a regular polygon.
The inscribed circle is the circle which touches all three sides of the triangle
The points
Between two mirrors
If a ray of light comes towards a surface under a certain angle, it is reflected with the same angle as on the picture.
Let