What are the characteristics of cylinders and cones?

Characteristics of a cylinder (right cylinder): the upper and lower surfaces are two circles with equal areas, called the base; the distance between the two bases is called the height; the side of the cylinder is a curved surface; after expansion, it is a Rectangle (square); the length of the rectangle obtained by expanding the cylinder is equal to the circumference of the base of the cylinder, and the width is equal to the height of the cylinder; when the base circumference and height of the cylinder are equal, the expansion is a square.

Characteristics of cones: There is a spire, the base is a circle, and the side is a curved surface; the distance from the apex of the cone to the center of the bottom is the height of the cone; the side of the cone unfolds into a fan shape.