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The sundial, which measures time, is the world's oldest scientific instrument.
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give 5 examples that involves measuring
A steel measuring tape will give an accuracy to within a millimeter. A laser 'gun' can also be used, but one that is more accurate than a normal measuring tape is rather expensive.
Two sides of a triangle do not, automatically, give you the measure of the third side. Further information about the triangle is required.
Early estimation can help give an indication of the answer.
Calipers are used to measure the dimension of anarticle. In measuring a section of pipe you would use an inside caliper to give the internal diameter, and an outside caliper to give the external diameter. The difference being the thickness of the pipe wall.