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No two-dimensional figure can have less than three sides, except a circle which has either 1 side or an infinite number of sides!
There are two pairs of parallel sides in a rectangle - 1 pair of lengths, and 1 pair of widths.Therefore, 4 parallel sides!
No. For example, the two perpendicular sides can be adjacent; in this case, the two sides can be of different length; the lengths of the other two sides aren't unique either.The two perpendicular sides can also be the two opposite sides (i.e., side #1 and side #3, if you count consecutive sides); here, too, there are multiple possible solutions. Just try it out!
1 pair of parallel sides mean 1 pair of non-intersecting lines for example, squares, their lines don't touch when they up or down.
No because a trapezoid has only 1 pair of parallel sides whereas a parallelogram has 2 pairs of parallel sides.
Oil
Yes, because the two sides were very evenly matched for much of World War 1.
Austria-Hungary and Serbia
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Italy
both sides were locked in a stalement
They shared food, sang Christmas songs and played ball.
Germany, Austria-Hungary, Italy-(later changed sides) Ottoman Empire Russia, United States, Great Britain, France, Italy-(after changed sides)
In world war one there were two sides: The Triple Entente contained The United Kingdom, Russia and France and The Triple Alliance contained Germany, Austria-Hungary and Italy. However, later on in the war, in April 1915 Italy changed sides to the Triple Entente.
Italy was the only country to switch sides at the very beginning. Bulgaria and Russia switched sides late into the war.
8'000'000 on all sides
$1 trillion