Did you know a Hexagon can be constructed using the angle pi/3 a lot of times? This is because a hexagon is made of 6 triangles with equal side length - the radius of the hexagon. The inner angles of these triangles is pi/3. Using this information and the trigonometric functions sin and cos can be used to draw such a picture.
I only see 3 that are fully red
May I ask how many hexagons you see in total? Do you count the partial ones in an extra category? Fully red, partially red and fully blue? I see 7 in total.
7 total: 1 pure blue, 3 pure red, 3 mostly red with a blue edge