A regular pentagon doesn't have any right angles ! See related link.
If you wan't to show that a pentagon has no right angles, then don't put any right angle signs in the figure.
No because the shape would have two right angles because of the parallel lines and the limited number of angles available...just no.
show the drawing
____________ / | /_____________ | Crappy drawing, I know, but a right trapezoid has two right angles(right side of picture), and two supplimentary non-right angles(left side of drawing). This is still a trapezoid because in order to be a trapezoid, there must be one and only one pair of parallel lines, and four sides. That's it, thus this is a possible trapezoid.
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A pentagon is a 5 sided shape. Google pentagon and it will show you a picture.
pentagon
A pentagon has 5 sides.
polygon and rectangle
a square, rectangle, rhombus.....
show me what a pentagon shape looks like
That's exactly what the box means! That box is there to show that an angle is right, as right angles can have different properties than acute or obtuse angles.