Radial lines are straight lines that extend outward from a central point, resembling the spokes of a wheel. They can be found in various contexts, such as in art, design, and nature. For example, the petals of a flower often radiate from the center, creating a visually appealing pattern. In geometry, radial lines are used to describe shapes like circles and spheres. The distance from the center to any point on the circumference is called the radius, which is essential in calculating the area and circumference of a circle. Understanding radial lines helps in grasping concepts related to symmetry and balance in both mathematics and visual arts.