Constraint selection commands, such as Select Top and Select All, help in selecting multiple constraints after which, with one context menu. You can also suppress constraints and animate components in an unconstrained condition. I used the tangent circle and selected the top, bottom and right sides of our box. Inventor Studio uses assembly constraints and parameters as animation input enabling you to animate the same mechanistic movement you are designing into your product. You can make two types of circles, from center or tangent, for tangent you select lines that you want the circle to be tangent to. There is a Circle selection box right next to the LINE selection. If you want to make a shape the line will be selected still and will connect everywhere you click unless if you right-click and press ok, cancel or if you connect the line to a point. When you have made one line you can continue on to make a square, You don't have to select The LINE option every time you want to make a line. To switch between the line distance and angle box press tab. When you click you have the option of choosing the distance and angle. Its really easy, you select LINE and you can click on any part of the screen. You don't always have to start sketching this way though, if you have a 3d object already you can start a 2d sketch on the side of it! We will start on the left side of the tool bar and work our way right. I use the y, x plane, so click on the top-left corner. You will see like a matrix of each plane (x, y, z). So to start off with a sketch click CREATE 2D SKETCH. When you are designing you will usually always start off with a 2d sketch.

Autodesk inventor tutorial animation