There are a few ways to make a curved line in Photoshop. One way is to use the Curved Lines tool. The Curved Lines tool is located in the Tools palette, and it is used to make a curved line. The Curved Lines tool can be used to make a straight line, as well. The Curved Lines tool can also be used to make an arc. The arc can be made by using the Radial Marquee tool, and the Radial Marquee tool can be used to create a radial line. The radial line can be made by using the Ellipse Tool, and the Ellipse Tool can be used to create an ellipse. The ellipse can be made by using the Polygonal Lasso Tool, and the Polygonal Lasso Tool can be used to create polygons.