Mysterious Mathematics

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Across
  1. 2. The special name given to the perimeter of a circle.
  2. 6. An _______________ is a true statement containing an equals sign.
  3. 7. The most suitable unit used to measure the length of a room.
Down
  1. 1. This is the longest side of a right-angled triangle.
  2. 2. When two triangles are equal in all respects, they are said to be _______________.
  3. 3. There are two kinds of symmetry: Line and _______________ Symmetry.
  4. 4. A triangle with 3 equal sides is called an _______________ triangle.
  5. 5. The number of lines of symmetry that a regular octagon has.