How many 4-sided plane figures are there?

Answer 1

Here's the role call of the quadrilaterals:

# square # rectangle # rhombus # kite # parallelogram, # trapezoid or trapezium (depending on which side of the pond you're from) Certainly we left off the chevron and some other "irregular" shapes, but this list will get you started. A link can be found below for you to review these planar shapes and check their definitions.