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HOW DO WE KNOW
How to Measure Shapes?
How a City Is Measured?
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accuracy acre Alexander Graham Bell astronaut Aztec sun stone barometer batteries body buildings bulb buoyancy of water calculate calendar called calories calories per 3.5 carbohydrates Celsius changes cities clock Density depth developed displaces distance dives Earth's surface Egyptians electromagnetic ERNST MACH fastest feet form of energy frequency Galileo Geometry gold grams Greenwich Meridian Greenwich Meridian Line heat hertz horizon horsepower inches instrument invented James Joule joules kilogram Latitude light travels Mach Measure Angles meter metric system miles per hour million molecules moving object ocean floor Philo of Byzantium pints place on Earth plane pole pounds pressure protein reliable Roman Santorio Santorio Santorio scale scientist ship shock waves sonic boom sound barrier sound waves space spectrum Speed of light speed of sound standard unit stars stone stone weight submarine tallest telescope temperature theodolite thousands triangle tube vibrations volts volume wavelength zone