-18.5
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Since 12 cm is .12 m the scale is .12/20 = .006 . Meaning on the graph 1 m is represented by .006 m or .6 cm. So 15 m would be scaled down to 15 x .6 = 9 cm on the graph.
2000
20 cm times 15 cm = 300 square cm
20' = 609.6 cm or 6.096 meters.
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