How did Sue draw the arc river line?

Draw an arc triangle on the plane, and then pull it up directly with the push-pull tool.

Draw a random figure on this surface and stretch this triangle, and you will get a line perpendicular to this surface. On the drawn vertical line, double-click the line with the tape measure tool to generate an auxiliary line, and then pull the triangle back to delete it.

Use the protractor tool to draw a 90-degree auxiliary line along the hypotenuse. Use the tape measure tool to pull the auxiliary line directly from the coordinate axis and put it on the inclined plane. You can turn your cuboid into a curved body, which is very convenient for making some curved landscape walls or curved gardens. You can turn your plane curve into a three-dimensional curve, which is suitable for making special-shaped structures. Often used in conjunction with spatial curves, such as spiral stairs and special-shaped buildings, can basically be made quickly.