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Extended information This paper examines students' understanding of graphics;

In two-dimensional space, several spatial shapes can be divided by contour lines. Graphics is a part of space, which is a limited and recognizable shape and has no spatial extensibility. A vector diagram composed of external contours. That is, straight lines, circles, rectangles, curves, charts and so on drawn by computers.

A graph uses a set of instructions to describe the content of the graph, such as describing the position dimension and shape of various primitives that make up the graph. The description object can be scaled at will without distortion. On the display side, graphics use special software to convert instructions describing graphics into shapes and colors on the screen.