the.com/quadrilateral
Any shape with four sides and the audacity to call itself one thing.
means A closed, flat shape with exactly four straight sides and four angles — squares, rectangles, rhombi, trapezoids, and every lopsided cousin of theirs.
from Built from Latin quadri- (four) and latus/later- (side), the same 'later-' that gives us 'lateral.' It's a straightforward Latin compound, roughly 'four-sided,' coined when geometry still spoke Latin in classrooms and texts.
- family size
- squares, rectangles, kites, trapezoids all qualify
- angle sum
- interior angles always total 360 degrees
- loosest club
- no rule says sides or angles must match
- diagonal trick
- two diagonals always split it into two triangles