Right angled triangle

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Across
  1. 3. polygon with three sides and three angles.
  2. 4. how many types of a triangle by its angle is there
  3. 5. A triangle with one 90-degree angle
  4. 6. The longest side of a right-angled triangle, opposite the right angle.
  5. 7. Having the same shape but possibly different size.
Down
  1. 1. Identical in shape and size.
  2. 2. A mathematical formula relating the sides of a right-angled triangle, stating that the square of the hypotenuse is equal to the sum of the squares of the other two sides.