pentagon
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A rhombus has parallel lines but no perpendicular lines.
A trapezoid is a shape which has parallel lines and two other lines connecting the parallel ones.
a trapezium
A regular pentagon has no parallel lines, but you can create an irregular pentagon with one pair of parallel lines if you make a traditional 'house' shape with parallel 'walls'.
To indicate that a pair of lines are parallel you mark them both with an arrow. If there is another pair of parallel lines on the same shape you mark those with a double arrow.