Crossword #2 (medium difficulty)

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Across
  1. 2. "A formula for finding the area of a triangle based on its side lengths."
  2. 5. "A perfectly round three-dimensional object with all points on its surface equidistant from its center."
  3. 6. "The minimum number of colors needed to color the vertices of a graph such that no two adjacent vertices share the same color."
  4. 7. "A mathematical formula relating the lengths of a triangle's sides to the cosine of one of its angles."
  5. 9. "A graph in which edges have a direction, indicating a one-way relationship between connected vertices."
  6. 11. "A concise mathematical expression used to describe a relationship or calculate a result."
  7. 13. "The longest sequence of activities determining the minimum time for a project."
Down
  1. 1. "The sides of a three-dimensional geometric figure excluding the base."
  2. 3. "A closed path that includes every edge of a graph exactly once."
  3. 4. "The characteristic of existing in length, width, and height."
  4. 8. "The branch of mathematics dealing with the relationships between the angles and sides of triangles, especially right triangles."
  5. 10. "A route that visits each vertex exactly once in a graph."
  6. 12. "A polyhedron with a polygonal base and triangular sides that meet at a common vertex."