## rebecca1233 Group Title A polygon has an area of 100 square inches and one of its sides is 20 inches long. If a second similar polygon has an area of 36 square inches, what is the length of the corresponding side in the second polygon? 5 in 8 2/3 in 12 in 33 1/3 in one year ago one year ago

1. rebecca1233 Group Title

@erdog82

2. erdog82 Group Title

ok so, I believe you need to st up a proportion

3. rebecca1233 Group Title

4. erdog82 Group Title

ok I am trying to..

5. erdog82 Group Title

so you know the areas of each polygon, right?

6. rebecca1233 Group Title

36?

7. erdog82 Group Title

and what?

8. rebecca1233 Group Title

100?

9. erdog82 Group Title

yes, good :)

10. rebecca1233 Group Title

so what now ?

11. erdog82 Group Title

|dw:1358803903084:dw|

12. erdog82 Group Title

solve for x

13. erdog82 Group Title

14. Mertsj Group Title

Not one of the choices.

15. rebecca1233 Group Title

16. erdog82 Group Title

did you see the drawing?

17. erdog82 Group Title

?

18. rebecca1233 Group Title

yes i saw it..

19. erdog82 Group Title

try solving for x

20. rebecca1233 Group Title

100x = 36*20?

21. erdog82 Group Title

yup.

22. rebecca1233 Group Title

720 = 100x

23. rebecca1233 Group Title

then i divided and i got 7.2 but thats not one of the option choices..

24. erdog82 Group Title

|dw:1358804299965:dw|

25. erdog82 Group Title

oh yeah, what the heck?

26. Mertsj Group Title

Sorry but the ratio of the sides squared would be the ratio of the areas. And so the square root of the ratio of the areas would be the ratio of the sides.

27. erdog82 Group Title

huh?

28. Mertsj Group Title

So if the ratio of the areas is 36/100, the ratio of the sides is 6/10

29. rebecca1233 Group Title

7.2 is not an option for the answer.. answer options r .. 5 in. 8 2/3 in 12 in and 33 1/3 in

30. erdog82 Group Title

@Mertsj you can help @rebecca1233 now... I guess you are better at this than I am

31. Mertsj Group Title

6/10=x/20 Solve that if you want the answer.

32. rebecca1233 Group Title

so 6x= 10*20?

33. rebecca1233 Group Title

help me ?

34. rebecca1233 Group Title

hello @Mertsj

35. Mertsj Group Title

$\frac{6}{10}=\frac{x}{20}$

36. Mertsj Group Title

Can you solve that proportion?

37. rebecca1233 Group Title

so 6 *20

38. rebecca1233 Group Title

hen divie by 1 which gives u 12

39. rebecca1233 Group Title

12 in is correct answer right?

40. Mertsj Group Title

yes

41. rebecca1233 Group Title

i need help with another problem please

42. Mertsj Group Title