I went ahead and drew an arc in HTML5 CANVAS the canvas I used has a width of 1275px and a height of 590px. Pixels are a unit of measurement. Pixels are 1/96 of your computer screen. I used my full screen. To draw an arc, you pick an x coordinate and a y coordinate I choose the middle of my screen. Since I am using the canvas, my coordinates were canvas. Width and canvas. Height. You then pick a radius mine was 275px. then a starting angle and an ending angle after that you choose the direction you want it to go either clockwise or counterclockwise. I used many colors to create this arc and used different starting angles and end angles.