A right angle triangle has no parallel sides
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A square is a right angled parallelogram with 4 right angles and all opposite sides parallel.
A right angled trapezium (trapezoid).
If it is two parallel side, rather than two pairs, then it could be a right angled trapezoid, a rectangle or a square.
right angled triangle does not have all equal sides
only two sides should be parallel, the other two sides should be angled.