Is 5051 > 5150 or vice versa?
Good question! Here the exponential function helps.
√2 + √3 ≈ π – what does that mean?
Is there a geometric meaning to this?
Three Brothers And A Piece of Land
Can you help three brothers settle their argument?
Prime number pairs
How many different paris of prime numbers are there for which the sum is 999?
Tetrahedron
At what angles do the connecting lines of the edges of a regular tetrahedron intersect?
20 Building Blocks For A Square
Can you make a single square out of 20 right triangles?
Transformation Into A Square
Draw 4 straight lines in a cross figure to represent a single square of equal area.
With Only One Line
Look closely to find the right line.
Geometry with a postcard
How can you find the sides of a rectangle that has the same area as a given square without a compass, without a ruler – even without a pencil – if all you have available is a postcard?