PLANE GEOMETRY

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Across
  1. 2. line segment drawn from a vertex of a triangle perpendicular to its opposite side
  2. 8. If anyone angle is greater than 90°
  3. 10. A triangle having three equal sides
  4. 12. If each angle is less than 90°
Down
  1. 1. A triangle whose one angle is a right-angle
  2. 3. A closed curve made of three line segments
  3. 4. angle of a triangle formed when a side of a triangle is produced
  4. 5. A triangle having two equal sides
  5. 6. line-segment joining a vertex of a triangle to the mid-point of its opposite side
  6. 7. A famous theoreme
  7. 9. the three angles of a triangle is 180°.
  8. 11. A triangle having three unequal sides