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## gabbyalicorn one year ago What is the perimeter of the figure to the nearest hundredth of an inch? A. 68.24 inches B. 43.12 inches C. 38.56 inches D. 26 inches

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1. gabbyalicorn

posting pic right now...

2. gabbyalicorn

3. triciaal

add the lengths all around the figure

4. gabbyalicorn

34

5. triciaal

|dw:1433136112597:dw|

6. anonymous

what do you think the answer is? @gabbyalicorn

7. triciaal

|dw:1433136200589:dw|

8. gabbyalicorn

so... -3- i think the first 1 is 25.12 and then the second one is 94.2

9. anonymous

to find the circumference of the circle, divide it by two since it is a half circle then add the perimeter of the rectangle like @triciaal is showing you

10. triciaal

stop and think the answer to 2 decimal places

11. anonymous

if i am right because i am kind of having trouble a little lol

12. gabbyalicorn

so 47.1 i divided 94.2 by 2

13. gabbyalicorn

its close 2 b

14. triciaal

@YoungTrilogyFT3 correct explanation minor adjustment only 3 sides of the rectangle and add the semicircle

15. gabbyalicorn

I still dont get it

16. gabbyalicorn

@geerky42 @MonKiwi @UsukiDoll

17. triciaal

it is very rude to tag other people when you are being helped instead of saying what you need more help with.

18. gabbyalicorn

Oh, sorry. :( i did not know it would offend you @triciaal

19. gabbyalicorn

but you are right... forgive me

20. geerky42

Your goal is to find length of that red line.|dw:1433133208001:dw|

21. geerky42

You can do so by "split" line into sommething like this:|dw:1433133292825:dw|

22. geerky42

then you only have to calculate perimeter of semicircle then add side length of that rectangle.

23. gabbyalicorn

is there a way to check it like for ex (just making this up) 68.24 - 47.1 or something like that?

24. geerky42

Not that I know of.

25. gabbyalicorn

Okay.

26. gabbyalicorn

well the semi-circle is 34

27. gabbyalicorn

wait no thats for the rectangle

28. geerky42

Well, so what I said, is it clear? can you find total perimeter now?|dw:1433133488047:dw|

29. geerky42

First, what is perimeter of semicircle with radius 4?

30. gabbyalicorn

8?

31. geerky42

How?

32. gabbyalicorn

|dw:1433133602296:dw|

33. geerky42

I said perimeter of semicircle

34. geerky42

|dw:1433133652499:dw|

35. gabbyalicorn

|dw:1433133676207:dw|

36. geerky42

Do you know how to do that?

37. gabbyalicorn

no, im still confused

38. geerky42

it's half the circumference

39. geerky42

Right?

40. geerky42

And you know that $$C = 2\pi r$$ So half circumference would be $$\dfrac{C}{2} = \pi r$$

41. geerky42

Here, we have radius of 4, so what's half the circumference?

42. gabbyalicorn

12.56

43. gabbyalicorn

what i did wad 2 x 3.14 x 4 divided by 2

44. geerky42

Yep. |dw:1433133891727:dw| Now what about rectangle sides?|dw:1433133936113:dw|

45. gabbyalicorn

9+8+9= 26 so then im guessing to do $12.56 \div 26$

46. geerky42

Why divide?

47. gabbyalicorn

I have no clue, im just trying to figure out what operation. so if its not division its multipulcation am i right?

48. geerky42

You have 2 apples and you have other three apple. To find total apple, you don't do division, right? You would use addition.

49. gabbyalicorn

you're right I just multiplied and the answer was way off.

50. gabbyalicorn

38.56

51. gabbyalicorn

omg C

52. gabbyalicorn

:DDD hazaaa!

53. geerky42

|dw:1433134238968:dw|

54. gabbyalicorn

Thank you thank you thank you so much! @geerky42 and @triciaal im sorry it took me a while

55. geerky42

It's cool, and welcome!

56. gabbyalicorn

You never gave up on me :D

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