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by dividing diameter by 2 :)
Accurate linear measurement.
The answer depends on the size of the cube: it could be a micrometre, vernier callipers, a ruler, a tape measure.
A vernier caliper should be used to measure the diameter of a steel ball.
It depends on what you are trying to measure. If you are measuring the length of a car, for example, any reading obtained using vernier callipers is likely to be totally useless. The key is to select a tool that is appropriate to the task.
If you have calibrated eyeballs
by dividing diameter by 2 :)
A caliper is commonly used to measure the diameter of a copper wire. It can provide precise measurements by using its jaws to grasp the wire and providing a reading of the diameter on its scale.
A vernier caliper or a micrometer can be used to measure the internal diameter of a beaker. These tools provide accurate measurements of dimensions, including internal diameters, with precision.
Because they were invented by Pierre Vernier in 1631.
I would use vernier callipers.
Vernier calipers are used to measure lengths with high precision, especially in applications where accuracy is critical. They consist of a main scale and a sliding vernier scale, allowing for measurements to be taken to a fraction of the smallest division on the main scale. They are commonly used in engineering, woodworking, metalworking, and scientific experiments.
To measure things, or is that just too obvious? A.K.A. Vernier Callipers
Measure the length of its side - using vernier callipers for accuracy - and cube the result.
To measure the diameter of a capillary tube using a traveling microscope and vernier caliper, place the capillary tube on a flat surface. View the capillary tube through the traveling microscope to measure the external diameter. Then, use the vernier caliper to measure the internal diameter by gently inserting the capillary tube between the jaws of the caliper to get an accurate measurement. Subsequently, calculate the average diameter using the two measurements.
The jaws of the vernier calipers are used to measure the external diameter of a cylinder. The jaws are placed around the object being measured, and the reading is taken from the scale on the main body of the calipers.
To measure the inside diameter of a ring using a vernier caliper, you can gently open the jaws of the caliper, place them inside the ring, and then slowly close the jaws until they fit snugly against the inner circumference of the ring. Take the reading from the main scale and vernier scale where they align. This will give you the inside diameter measurement of the ring.