![]() Hence you get J, knowing that it is between O and O' which we both already know. You can find it on the circle dropdown or you can type CIRCLE and then type TTR. ![]() Step 2: If we want to draw some arc tangent to both circles with specific radius the easiest metod (at least for me) is by using TTR ( tangent tangent radius) circle. Noting AB is the vector from A to B, and |z| the norm of a vector z. Step 1: Lets say we have something like this, two circles with different radius. One thing that has been a constant frustration for me is drawing curves in Civil 3d. You can insert annotations or dimensions using smart dimensioning, insert text, images and even georeferenced raster images (tif, geotiff). That means you can draw lines, polylines, points, point clouds, circle, ellipse, spline, hatch, block. If the circles C and C' have respectively centres O and O', and radius r and r', then we know there exists a unique homothetic transformation with centre J and ratio a, such that : a = |JO|/|JO'| = r/r' Hello, I am still relatively new with Civil 3d, about 3 years now into the software, my previous 10 years was in Microstation. BabaCAD 2017 has everything that every professional CAD software must have. Tangent lines to circles form the subject of several theorems, and play an important role in many geometrical constructions and proofs. Both methods will enable TANgent object snap and you can pick point on the circle. Or you can type TAN and hit return when AutoCAD asks to pick start (end) point of line. 3 clicks only May be I have to make a video, though I am sure you understood the point I am trying to make. In Euclidean plane geometry, a tangent line to a circle is a line that touches the circle at exactly one point, never entering the circle's interior. To call OSNAP context menu, you can Shift+Right click, then select TANgent from context menu. ![]() So we are going to use a homothetic transformation. Yes sir, chief has make 'arc tangent' tool once you 'lock centers' of the two arcs drawn over the two circles you want to locate their tangent arc.
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