Millimeters or centimeters.
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Just look at it this way. More small toys can fit in a box than the number of big toys that can fit in a box. In units of measure meant there are a number of smaller units in a bigger unit. For example there are 100cm in a m and 100000cm in a km.
A2 has double the area of A3, with a width equal to the length of A3 and a length equal to double the width of A3
100 m long & 50 m width .
To measure the area of an arbitrary two dimensional shape you will use a planimeter. To measure an area you could also just use a simple ruler depending on how big the area is.
A centimeter is equivalent to 10 millimeters. It is approximately the width of a pinkie finger.