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An instrument that measures altitude, or height above a certain point. 


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a. An instrument, useful for predicting weather, that measures atmospheric pressure b. Something that registers or shows changes; an indicator 


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A line through the exact center of a figure, usually a circle or sphere 


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The branch of mathematics dealing with points, lines, angles, and shapes 


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A unit of length equal to 1,000 meters, or about 0.62 miles. 


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Grams, milliliters, and centimeters are metric units of measurement. 


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An instrument that marks time, with ticks or flashes at regular adjustable intervals. 


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a. An instrument that measures very small distances, objects, or angles. b. A unit of length equal to one thousandth of a millimeter, or one millionth of a meter. 


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An instrument that indicates distance traveled by a vehicle. 


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The outer boundary of a shape or an object, or the distance around that boundry. 

