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Are lines that lie in parallel lines always parallel?
That sounds to us like a very likely "yes" .
Why there are markings of two parallel white lines and yellow lines on roads?
(in the US) They indicate a no passing zone. The white lines indicate multiple lanes of travel in the same direction, while the yellow lines indicate opposing lanes of travel.
Do all trapeziums have diagonals of equal length?
No. Even in the non-US use of the term (a quadrilateral with at least one set of parallel lines), the lengths of the parallel lines may not be the same, and/or the angles formed by each adjacent side may be different (as in a rhomboid), resulting in diagonals of extremely different lengths.Only in rectangles are diagonals "always" of equal length.
Which is a quadlirateral that has one pair of parallel and a pair that's not parallel?
A trapezium (US: trapezoid).
How many pairs of equal angles does a trapezium have?
It may have none. A trapezium (US) has no parallel sides. A trapezoid (US, known elsewhere as a trapezium) has one side of parallel sides.
