This is an analog clock, which is used for telling time. The longer smaller in width line signifies the mintues while the shorter wider in width line signifies the hours. The skinny long red line signifies the number of seconds. The clock shown in the picture is mounted on a wall. An angle bisector is a line which cuts an angle into two equal halves. As you can see in the picture of the clock, the yellow line is bisecting the purple angle.
I got this image from: http://www.biglearning.org/photo-clock11.jpg
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