This is called a set square.
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Yes it can. Imagine a square with the corner cut off. The remaining shape is a pentagon with three right angles.
Strictly speaking a pentagon is a plane figure with five straight sides and five angles, so yes, a pentagon can have one - or more - right angles. Imagine a rectangle with one of the corners cut off - that would have five sides and three right angles. .......... ............. ................ .................. .................. .................. ..................
It's primarily a template for drawing lines at accurate right-angles and other angles to a line, usually 30º / 60º and 45º for standard set-squares. It's also used for drawing parallel lines. Adjustable set-squares allow you to set off other angles.
That's called a parallelogram.That's called a parallelogram.That's called a parallelogram.That's called a parallelogram.
Well, honey, to draw a trapezoid with no right angles, you start by drawing two parallel lines of different lengths. Then you connect the ends of those lines with two slanted lines, making sure they're not perpendicular. Voila, you've got yourself a trapezoid with all angles different from 90 degrees. Now go show off your fancy geometric skills!