Geometry · Triangles & Congruence
Scalene Triangle
HSG-CO.C.10
Definition
A triangle with all three sides of different lengths.
Examples
- A triangle with sides 5, 7, and 9 is scalene — no two sides match.
- A scalene triangle also has no two equal angles.
Key rule
A scalene triangle has no congruent sides and no congruent angles.
Memory hook
All different — no matching sides.