Geometry · Quadrilaterals & Polygons
Diagonal
HSG-CO.C.11
Definition
A segment that joins two non-adjacent vertices of a polygon.
Examples
- In quadrilateral ABCD, a diagonal connects A to C, skipping the adjacent vertices.
- A rectangle has two diagonals, and they are always congruent.
Key rule
A diagonal connects vertices that are not next to each other.
Memory hook
Skips a corner to connect across the shape.