The drawing's scale factor is 0.005
Scale factors are written as the ratio of measures of similar sides of a figure
From the given question, we have the following parameters
length of dining = 8 meters
Length in drawing = 4cm
Since the length in drawing the lower than that of real dining, the scale will be a reduction
Scale factor = 4cm/8m
Scale factor = 4cm/800cm
Scale factor = 1/200
Scale factor = 0.005
Hence the drawing's scale factor is 0.005
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