cross word puzzle

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