Across
- 3. A polygon with three sides
- 5. An angle of 90 degrees
- 8. Ancient Greek with a famous theorem
- 10. Two lines that meet at 90 degrees
- 11. A corner of a triangle
Down
- 1. A mathematical result we know is true
- 2. In a triangle the interior __ sum to 180 degrees
- 4. A quadrilateral with equal sides and angles
- 6. Longest side of a right angled triangle
- 7. When two shapes are exactly the same shape and size
- 9. The side of a triangle perpendicular to its height