Find the missing base of a parallelogram

Work backward from the area: divide the area by the height.

1. A parallelogram has an area of 21 cm² and a height of 7 cm. What is the length of its base?
2. A parallelogram has an area of 30 cm² and a height of 6 cm. What is the length of its base?
3. A parallelogram has an area of 48 cm² and a height of 8 cm. What is the length of its base?
4. A parallelogram has an area of 18 cm² and a height of 3 cm. What is the length of its base?
5. A parallelogram has an area of 72 cm² and a height of 9 cm. What is the length of its base?
6. A parallelogram has an area of 84 cm² and a height of 12 cm. What is the length of its base?
7. A parallelogram has an area of 45 cm² and a height of 5 cm. What is the length of its base?
8. A parallelogram has an area of 48 cm² and a height of 6 cm. What is the length of its base?
9. A parallelogram has an area of 144 cm² and a height of 18 cm. What is the length of its base?
10. A parallelogram has an area of 238 cm² and a height of 14 cm. What is the length of its base?
11. A parallelogram has an area of 130 cm² and a height of 13 cm. What is the length of its base?
12. A parallelogram has an area of 272 cm² and a height of 16 cm. What is the length of its base?
13. A parallelogram has an area of 665 m² and a height of 19 m. What is the length of its base?
14. A parallelogram has an area of 1360 m² and a height of 34 m. What is the length of its base?
15. A parallelogram has an area of 684 m² and a height of 19 m. What is the length of its base?
16. A parallelogram has an area of 486 m² and a height of 27 m. What is the length of its base?
17. A parallelogram has an area of 1628 m² and a height of 37 m. What is the length of its base?
18. A parallelogram has an area of 3776 m² and a height of 59 m. What is the length of its base?
19. A parallelogram has an area of 3920 m² and a height of 40 m. What is the length of its base?
20. A parallelogram has an area of 4774 m² and a height of 62 m. What is the length of its base?