anonymous one year ago how do i find the angle meaurement of ABC and ACB on a triangle.

1. jdoe0001

got pic?

2. Setsuna-Yuregeshi

What information do they give you?

3. anonymous

heres the triangle.

4. Setsuna-Yuregeshi

That's all they give you? (I'm just asking)

5. jdoe0001

what section is this meant to cover? are you doing trig? law of sines or cosines?

6. anonymous

just congruency and geometry. im really lost with this

7. Setsuna-Yuregeshi

O yeah, that's important @jdoe0001

8. jdoe0001

got any given choices?

9. Setsuna-Yuregeshi

What is the name of this part of the course? Like in the textbook, whats the unit or whatever.

10. jdoe0001

that is, what are they expecting as answer, a numeric value? an expression?

11. anonymous

i think a value. in degrees or something. The "ABC" has that little angle sign in front of it

12. Setsuna-Yuregeshi

But are there any choices?

13. anonymous

nope. its called Sides and Angles of Congruent Triangles

14. jdoe0001

ok... have you covered SOH CAH TOA yet? that is $$sin(\theta)=\cfrac{opposite}{hypotenuse} \qquad \qquad % cosine cos(\theta)=\cfrac{adjacent}{hypotenuse} \\ \quad \\ % tangent tan(\theta)=\cfrac{opposite}{adjacent}$$

15. anonymous

i have never seen this before in my life

16. jdoe0001

because... congruence is not going to get you far on this one, nor similarility

17. Setsuna-Yuregeshi

You're in the geometry course right? Or? If so, I believe SOH CAH TOA is supposed to be covered towards the end of algebra 1.

18. anonymous

i never covered it though

19. Setsuna-Yuregeshi

After you get the answer to your initial question I can explain SOH CAH TOA. Because if u answer using that when it has not been taught or covered so far, that will be suspicious or something.

20. jdoe0001

so.. I'd think this exercise may not apply to you then since you have not covered that, and I don't see how congruence will help on this triangle

21. anonymous

its on a graph though...so do the points count?

22. jdoe0001

yes... is on a grid, I can see that much so each vertex, A, B and C, have some coordinate to get their segment length, you'd need the distance formula that's simple enough but once you get the segment's length, you'd need to apply ..... hmm I'd use the law of cosines, to get any of the angles and you haven't covered any of that, thus, it may not apply to you

23. Setsuna-Yuregeshi

Or what if it has but, it was just forgotten?

24. jdoe0001

forgotten? then.... that may be a signal to call the amnesiac MD I'd thik =)

25. anonymous

its on an assignment i have to do. and i already calculated the the length.

26. jdoe0001

may well be, but you haven't covered the subject yet so... not much you could do there, without covering the subject the teacher hasn't done it is not very helpful if one is covering say... chapter 3 and dispenses exercises for students for chapter 6 if you're in say chapter 3, then that's what needs to be assigned

27. anonymous

one of the criteria is this though : Measure the angles of ABC and its images.

28. jdoe0001

maybe you're asked to use a protractor :), so.. use one hehe, that'd be simple

29. Setsuna-Yuregeshi

Is this homework or something? do you just fill in the blank? Or do you have to show your work?

30. anonymous

i have a protractor very simple. so how would i measure angle ABC with a protractor

31. jdoe0001

is it mineral, vegetable or animal? =)

32. anonymous

?? xD

33. Setsuna-Yuregeshi

Is that a joke? I don't get it.

34. anonymous

me either lol

35. Setsuna-Yuregeshi

Do you just put the answer? Or do you need to show your work?

36. jdoe0001
37. anonymous

just the answer. how would i do it with a protractor if i can use one

38. Setsuna-Yuregeshi

@jdoe0001 Is that where the joke is from?

39. Setsuna-Yuregeshi

Look at @jdoe0001's video.

40. anonymous

i know how to use a protractor. i just need to know which lines make up angle ABC

41. jdoe0001

Setsuna-Yuregeshi joke? hehe

42. Setsuna-Yuregeshi

It's this angle: |dw:1436228171391:dw|

43. Setsuna-Yuregeshi

In the pic you originally posted. It's the one that looks kinda like that.

44. jdoe0001

|dw:1436228999016:dw|

45. jdoe0001

|dw:1436229100396:dw|

46. Setsuna-Yuregeshi

How did you get it to be a different color?

47. Setsuna-Yuregeshi

O wait, never mind.

48. anonymous

ohh omg thanks. but which of the lines do i measure. the obtuse or the acute?

49. jdoe0001

@Setsuna-Yuregeshi click on [Draw] then click on [copy previous drawing] scroll up, pick it by clicking, then draw on it or delete from it by using the [selection] tool and pressing delete key

50. Setsuna-Yuregeshi

In the beginning you said you needed to measure ABC and ACB, look at @jdoe0001's drawings. He tells you which drawings are for which angles...

51. anonymous

yea. but which line do i measure, and which one do i put in the bottom line of the protractor

52. jdoe0001

either will do

53. jdoe0001

either line if you put on one, it'll give the same angle as if you were to put it on the other same angle

54. anonymous

i get it now. thanks so much for your help.

55. Setsuna-Yuregeshi

If you want, later we could teach you about SOH CAH TOA

56. anonymous

okay mabye