Heron's Formula

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Across
  1. 3. Branch of mathematics dealing with shapes and their properties
  2. 6. A corner or point where two sides meet
  3. 7. A polygon with three sides
  4. 9. Perpendicular drawn from vertex to base
  5. 10. One side of a triangle, often used in basic area formula
Down
  1. 1. Half the sum of all sides of a triangle
  2. 2. The length of a closed boundary that encompasses, surrounds
  3. 4. A mathematical expression or equation
  4. 5. Greek mathematician who gave a famous formula for triangle area
  5. 8. The space enclosed by a shape