Cylinder ‒ Stereometry

Right circular cylinder may arise from rotation of the rectangle A₁S₁S₂A₂ along the axis containing one of his sides - in our case along the line o = ← → S₁S₂. Rotation of vertices A₁ and A₂ creates the base edges of the cylinder, by rotation of line segments S₁A₁ and S₂A₂ the bases of the cylinder are created and rotation of the line segment A₁A₂ results with the lateral surface of the cylinder. The surface of a closed cylinder contains both bases (bottom and top) and the lateral area. The line o is called the axis of the cylinder, the individual positions of the line segments A₁A₂ create the side of the cylinder. The length of the line segment S₁S₂ is the cylinder's height, length segments S₁A₁ and also S₂A₂ are called cylinder's radius. The radius is half of the diameter. Rotary cylinder of which height is equal to the diameter is called equilateral cylinder.