ENJOY MATHEMATICS in 3D
Let's make a solid!

Let's gather some line segments vertical to a circumference.
A circle and line segments can be observed from various angles. What kinds of figures can be created?
Let's create three-dimensional figures by moving plane figures parallel! Let's create three-dimensional figures by rotating plane figures! Let's create surfaces of three-dimensional figures by moving line segments!
  • Let's create three-dimensional figures by moving plane figures parallel!
  • Let's create three-dimensional figures by rotating plane figures!
  • Let's create surfaces of three-dimensional figures by moving line segments!



Let's cut a solid!

Let's gather line segments vertical to a circumference.
A circle and line segments can be observed from various angles. What kinds of figures can be created?
Let's cut cubes with a plane! Let's cut spheres and cylinders with a plane! Let's cut cones with a plane!
  • Let's cut cubes with a plane!
  • Let's cut spheres and cylinders with a plane!
  • Let's cut cones with a plane!