Geologists have divided Earth's history into a series of time intervals. These time intervals are not equal in length like the hours in a day. Instead the time intervals are variable in length. This is because geologic time is divided using significant events in the history of the Earth.
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Tessellate2D shapesQuadrilateralfour sides
the sides that are parallel of each other are equal. * * * * * True, but that was not the question! In general, the diagonals are not of equal length.
If a rectangle has its length equal to its width, then all four sides are of equal length and it is a square.
No, an isosceles triangle has two sides of equal length. An equilateral triangle has all three sides of equal length.
A regular pentagon. A regular pentagon has five sides of equal length and its five angles are also equal. The term regular implies the notion of equal sides and equal angles.