Across
- 3. a three-sided polygon that consists of three edges and three vertices.
- 4. a book that is collection of definitions, postulates, propositions, and mathematical proofs of the propositions
Down
- 1. the perpendicular drawn from the vertex of the triangle to the opposite side.
- 2. the bottom line of a triangle.
- 5. he was an ancient Greek mathematician active as a geometer and logician. Considered the "father of geometry"