AI Tutor
Imagine a secret club where you can only enter if you have exactly four straight sides.
Any flat shape with four straight sides is called a quadrilateral.
Inside this club, shapes sort themselves by looking at their side lengths and parallel lines — lines that run side-by-side like train tracks and never cross.
What happens when shapes in this club start comparing their sides and corners?

Meet the Family

A rectangle has two pairs of equal parallel sides and four square corners that look like the corner of a book.
A rhombus looks like a slanted diamond, and its big rule is simple: all four sides must have the exact same length.
A square is the superstar of the family because it has all four equal sides AND four square corners.
If someone hands you a mystery shape, how do you know which group it belongs to?

Sorting Mystery Shapes

To sort any four-sided shape, ask two detective questions: Are all four sides equal? and Are all four corners square?