## Gabylovesyou one year ago Triangle congruence and similarity

1. Gabylovesyou

What is the flaw in the student's proof? Justification 4 should be "AB ÷ AD = AB ÷ AC because triangle ABC is similar to triangle ABD." Justification 1 should be "Angle ABC = Angle BCD and Angle BCA = Angle DBC." Justification 2 should be "BC ÷ DC = AC ÷ BC because triangle ABC is similar to triangle BDC." Justification 3 should be "Angle ABC = Angle ADB and Angle BAC = Angle BAD."

2. Gabylovesyou

@ganeshie8 I don't get this one ;/

3. ganeshie8

|dw:1393350721762:dw|

4. ganeshie8

first two statements are about using : $$\triangle ABC \sim \triangle BDC$$

5. ganeshie8

there is no flaw in those statemetns

6. ganeshie8

lets look a bit closely at statement 3

7. ganeshie8

|dw:1393350999487:dw|

8. ganeshie8

say, that angle = $$\alpha$$

9. ganeshie8

you wid me ? :)

10. ganeshie8

if u set up the angles correctly u will get : Justification 3 should be "Angle ABC = Angle ADB and Angle BAC = Angle BAD."

11. Gabylovesyou

oh ok thank you so much and sorry... openstudy is kinda acting crazy for me

12. ganeshie8

same here... it is acting up from last couple of hours lol

13. ganeshie8

i see all oranges.. and lag..

14. Gabylovesyou

yessss !! me too haha

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