Many ways.
A typical ruler is 30 cm long so three and a third such rulers is one possibility.
A typical doorway in my house is 2 metres high so half that height.
The distance from the fingertip of my outstreched arm to the opposite shoulder is approx 96 cm, so a bit more than that.
For longer distances, my stride is approx 1.3 metres.
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To estimate the measurement of one meter, you can use common objects as reference points. For example, a typical stride is around one meter, so you can count how many strides it takes to cover a distance. You can also use a ruler or measuring tape to measure objects that are known to be one meter in length and compare them visually to the distance or object you want to estimate.
Square meters is a measurement of area. Cubic meter is a measurement of volume. One has little to do with the other.
This is like comparing apples and oranges. A meter is a one dimensional measurement, and a meter squared is a two dimensional measurement.
It is one centimeter
There is no such unit of measurement as the "pipe".
A centimeter