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Estimate How Far Away Here is a clever method to estimate to how far away something is: Hold your arm straight out, thumb up Close one eye, align your thumb with distant object Switch eyes (don't move your thumb!) Your thumb will seem to change position Now ... estimate how far it moved sideways (you could imagine the length of a car or something). Multiply that by 10 and you have an estimate of how far away. Example: Here your thumb seems to jump about half a car length. Half a car length is about 2.5 meters (8.2 ft) Times 10: the car is about 25 meters away. (82 ft) How it Works x10. The distance from your eyes to your thumb is about s 10 times the distance between your eyes x10- * And so the distance to the far object is also about 10 times the width your thumb seems to move at the far object. Learn the Size of Things To be useful you need to know how long, wide or tall things are! Small cars are 4 m (13 ft) long Large cars are m (16 ft) long Cars are about 1.8 m (6 ft) wide Adults are about 1.8 m (6 ft) tall year old , about 1 m (3.5 ft) tall A normal doorway is 2 m (6.5 ft) high and 0.8 m (2.6 ft) wide A truck and trailer is about 20 m (65 ft) long The width of small house is about 8 | (26 ft) The width of a large house is about 12 m (40 ft) The height of a single-storey house is about 5 m (16 ft) The height of a two-storey house is about (26 ft) Tall buildings have about 3.5 m for every storey (12 ft) (Note: to use this method for height, tilt your head and thumb 90° to the side.)

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