56.6
step-by-step explanation:
the ratio of the perimeters is equal to the scale.
the ratio of the areas is equal to the square of the scale.
34 / 20 = k
a / 19.6 = k²
substituting:
a / 19.6 = (34 / 20)²
a = 19.6 (34 / 20)²
a ≈ 56.6
1. 3.4/4
2. 0.8/7
3. 0.5 x 3
4. 0.9 x 6
5. 10.8
6. 2.35
7. 0.567
8. 9.35
9. 0.02
10. 0.06
11. 0.16
12. 0.42
13. 0.63
14. 5.6
15. 8.1
16. 9.9
17. 0.28
18. 0.48
19. 0.27
20. 0.49
21. 0.45
22. 0.72
23. 0.9
24. 0.88
25. 0.75
26. 0.16
27. 0.328
28. 0.495
29. 0.72
30. 1.068
7/2
(decimal: 3.5)
welcome ; )