Let's create surfaces of three-dimensional figures by moving line segments!

A line segment moving along the circumference of a circle

	Gathering line segments vertical to the circumference Gather line segments vertical to the circumference. The circle and line segments can be observed from various angles. What kinds of figures can be created?
	Gathering line segments linking points on the circumference and vertexes Gather line segments linking points on the circumference and vertexes. The circle and line segments can be observed from various angles. What kinds of figures can be created?

A line segment moving along the perimeter of a square

	Gathering line segments vertical to the perimeter of a square Gather line segments vertical to the perimeter of the square. What kinds of figures can be created? When a line segment is not vertical, what figure is created?
	Gathering line segments of a fixed angle along the perimeter of a square Gather line segments of the fixed angle along the perimeter of the square. What kinds of figures can be created?
	Gathering line segments linking points on the perimeter of a square and vertexes Gather line segments linking points on the perimeter of the square and vertexes. What kinds of figures can be created? When the vertex's location is moved, what kind of a figure is created?    In addition, are there any common and different points regarding the created figures and their methods of creation when the already created figures are compared?