cross word puzzle

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Across
  1. 2. 4 X side is the formula to find the perimeter of________,
  2. 3. as_____,
  3. 4. Four sided closed figure is known as_____,
  4. 8. The perpendicular line from the vertex to the base is
  5. 9. The surface covered in a plane is____,
  6. 10. One of the angle in a right angle triangle is____,
  7. 11. Sum of length of all sides in a closed figure is known as____,
Down
  1. 1. Three sided closed figure is known as_____,
  2. 5. length X breadth is the formula to find the area of ___,
  3. 6. In _______triangle all sides are equal
  4. 7. If two sides are equal in a triangle then it is called as______triangle
  5. 12. Corresponding angles are always