I have tried to make different calculations to put the rounded corners together with a long bend. I know the points where the long bend begins and where it ends, as well as how high it should be. but my calculations do not work start (left) x1=10.00, y1=49.25 middle     x2 = 60.50, y2 = 51 end (right) x3 = 101, y3 = 49.25First, I calculate the radius of an imaginary circle using the formula below The center of the virtual circle has the coordinates x0 and y0 | s = | x3 - x1 | 91,00000000 | | h = | y2 - y1 | 1,75000000 | | r = | ((s^2) + (4*h^2)) / (8*h) | 592,37500000 | | h = | r - ( rot(4 * r^2 - s^2) / 2) | 1,75000000 | | s = | 2 * rot( h * (2*r - h)) | 90,99038411 | | x0 = | x2 | 60,50000000 | | y0 = | y2 – r | -541,37500000 | Previously, I calculated the angles of the circle sector and used "my" function to create the [x,y]-values for the arc. (but failed)Either the arc did not reach the start and stop values or it ended up a little too high or low. (I have no idea why) In this caset, I thought to create a table with the start value first and the end value last. Now I know x0, y0 and the r (radius) - from above and use this formula .: Rewrites the formula so that it becomes a function of y | Step1 .: r² = (x - x0)² + (y – y0)² Step2 .: (y - b)² = r² - (x – a)² Step3 .: y = ROT(r² - (x - x0)²)+y0 Finally, I set the start value (x1), middle value(x2) and the end value(x3) and calculate the y values. | x = | y0 =        | desire | difference | | 10 | 49,64766471 | 49,25 | -0,397664708819093 | | 60,5 | 51,49981502 | 51,5 | 0,00018497967755593 | | 101 | 50,25505002 | 49,25 | -1,00505001815964 | | (it was complicated to make the tables in the email) I do not know why the calculated result differs from the desired value. I think it's quite a lot - In the column on the far right - The center point differed the least (However, got better result than using angles) What can be done to get an even better result? [10, 49.25], [60.5, 51.5], [101, 49.25] (and many values between these) Attach some code for possible test $fa = 12;$fs = 0.5;fn = 50;// y = 80-2000;// points3 = circSect(0, 0, 2000, [0, 180], "left", 1, fn);// points3 = circSect(0, 80-2000, 2000, [87, 93], "left", 1, 1000);// points3 = circSect(55.5, 50.55-2000, 2000, [87.151, 92.826], "left", 1, 1000);// polygon(points3); p1x = 10;       // the start valuep1y = 49.25;    p2x = 60.50;       // the middle valuep2y = 51;p3x = 101;      // the end valuep3y = p1y; // http://matmin.kevius.com/cirkel.php// r = ((s^2) + (4*h^2)) / (8*h) s = p3x - p1x;   // 91h = p2y - p1y;   // 1.25radius = ((s^2) + (4*h^2)) / (8*h); // 828.725echo(s, s^2, h, 4*h^2, 8*h, radius);echo(""); // http://www.rasmus.is/sv/t/G/su30k3.html// deg = degrade( sin( a / radius ));deg1 = asin( (s/2) / radius );  // 3.14733deg2 = deg1*2;                  // 6.29466echo( deg1, deg2 );echo(""); // frDeg = 90-30;// toDeg = 90+30;frDeg = 90-deg1;  // 3.8183 (3.872)toDeg = 90+deg1;  // (4)xPos = 55;yPos = 51.5-radius;  // 50.79 points0 = circSect(  xPos, yPos, radius, [frDeg, toDeg], "left", 1, 4000); // Hörn nere till vänsterpolygon(points0); //points1 = circSect(  10, 11.25,  10, [0, 90], "bottom", 1, fn); // Hörn nere till vänster points2 = circSect(  10, 39.25,  10, [0, 90], "left",   1, 100); // Hörn uppe till vänster points3 = circSect( 101, 39.25,  10, [0, 90], "top",    1, 100); // Hörn uppe till höger  //points4 = circSect( 101, 11.25,  10, [0, 90], "right",  1, fn); // Hörn nere till höger  echo(points2) // [0,39.25]  - [10, 49.25]echo("");echo(points0) // [9.5, 50.25] - [97.9774, 50.3849]echo("");echo(points3) color("cyan"){polygon(points0);// polygon(points1); polygon(points2);polygon(points3);// polygon(points4); // polygon(concat(points2, points0, points3));}; // polygon(concat(points1, points2, points3, points4)); // https://openhome.cc/eGossip/OpenSCAD/SectorArc.htmlfunction circSect(x=0, y=0, radius=10, angles=[0,270], startRef="bottom", rotate=1, fn=24)  =    let(        startAngel  = (startRef == "left")   ?   0                    : (startRef == "bottom") ?  90                    : (startRef == "right")  ? 180                    : (startRef == "top")    ? 270                    : undef,        r = radius,        //r = radius / cos(180 / fn),        step = 360 / fn,        // points = [[x, y],        points = [            for(a = [angles[0]-startAngel : step : angles[1]-startAngel])                [-rotate * r * cos(a)+x, r * sin(a)+y]]    ) points;