Triangles

1234567
Across
  1. 3. Sum of all sides of a polygon
  2. 6. A triangle with all its sides equal
  3. 7. A triangle with all angles less than 90°
Down
  1. 1. A triangle with one right angle
  2. 2. A triangle with one angle more than 90°
  3. 4. A triangle with two sides equal
  4. 5. A triangle with all its sides unequal