Across
- 4. parallelogram with 4 equal sides
- 6. number by which a dividend is divided
- 8. front of the number
- 10. difference between the two number
- 11. total of two numbers
- 12. triangle：three line are equal
Down
- 1. triangle:a triangle with no two sides of equal length
- 2. triangle:a triangle with two equal sides
- 3. quotient of 80 divided by 2 is 40
- 5. total number
- 7. quadrilateral with two parallel sides
- 9. triangle:a triangle with one right angle