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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. |
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