## anonymous one year ago help!

1. anonymous

yes

2. anonymous

3. anonymous

yes @geny55 ?

4. anonymous

is this a pretest?

5. anonymous

@Astrophysics

6. Astrophysics

Perimeter is the distance around the 2d shape, so |dw:1433638990215:dw| add all the numbers for the perimeter and the area of a rectangle is just length x width$Area = l \times w$ once you have that you can multiply both of them by 7.5.

7. anonymous

so i do 6+6+8+8? @Astrophysics

8. Astrophysics

Yes that's the perimeter

9. Astrophysics

But you must multiply it by 7.5 for the scale factor

10. anonymous

i got 210

11. Astrophysics

Sounds good, now find the area

12. anonymous

how

13. anonymous

??

14. Astrophysics

15. anonymous

whats the area?

16. anonymous

210?

17. Astrophysics

No that's the perimeter, the area of a rectangle is length multiplied by the width.

18. anonymous

and whats the length and width

19. anonymous

@Astrophysics

20. Astrophysics

You should really know this by now, |dw:1433640168475:dw| Note that the scale factor for area, the change in area is equal to the scale factor squared, which means the scale factor for area is $7.5^2$

21. anonymous

so its 6 x 8

22. Astrophysics

That's for the unscaled rectangle, yes.

23. anonymous

so thats the length x width

24. Astrophysics

Yes

25. anonymous

ok so whats the area

26. Astrophysics

I feel as if you're ignoring everything I've said

27. anonymous

im not I'm learning :) @Astrophysics

28. anonymous

i got d

29. Astrophysics

ok

30. anonymous

am i right? @Astrophysics

31. Astrophysics

How did you get the area?

32. anonymous

area = 6 x 8 6 x 7.5= 45 8 x 7.5= 60 is that right? @Astrophysics

33. Astrophysics

Not quite, nice try though. Remember what I said to note earlier: Note that the scale factor for area, the change in area is equal to the scale factor squared, which means the scale factor for area is$7.5^2$

34. Astrophysics

$area = l \times w \times 7.5^2$

35. anonymous

i got 2,700

36. Astrophysics

Good!

37. anonymous

yay!