A real-life object that is approximately equal to a meter is a standard Baseball bat, which typically measures around 0.9 meters in length. Another common object is a guitar, which is usually around 1 meter long. Both serve as practical references for visualizing the length of a meter in everyday life.
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Soccer ball
an Egyptian pyramid
a split in half heart
A real life object of a quadrilateral is a windowpane.
The significance is that not everything can be expressed with whole numbers. This is especially clear in the case of measurements; a certain unit has been chosen as the standard of length (the meter); the length, width, or height of real-life objects will usually not happen to be an exact multiple of the meter (or close enough to that), so that fractions have to be used.