Triangles

12345678910111213
Across
  1. 4. has an acute angle
  2. 9. smaller than right angles
  3. 11. three equal sides
  4. 12. has one obtuse angle
  5. 13. 90 degree angles
Down
  1. 1. which states in any right triangle
  2. 2. greater than right angle
  3. 3. the side opposite to the right angle
  4. 5. two equal sides
  5. 6. without an equal side
  6. 7. has one right angle
  7. 8. polygon with three corners and three sides
  8. 10. measures the size of an angle