A number of different instruments have been invented to do the job.
They include:
-- the ruler
-- the yard stick
-- the meter stick
-- the tape measure
-- the odometer
-- the split-lens rangefinder
-- the laser rangefinder
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Ex.: ruler, caliper, micrometer, special microscope, graduated tape, etc.
The instrument used to measure a angle is called a protractor!
feet
....It can help us find the length of the "HYPOTENUSE" easier.....The Pythagorian Theorem is used to find the missing length of one side of a triangle. A^2 + B^2 = C^2
the ruler The meter stick