Question

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 BDC and Angle BCA = Angle BCD."

Justification 2 should be "BC ÷ DC = BC ÷ AC because triangle ABC is similar to triangle BDC."

Justification 3 should be "Angle ABC = Angle BAD and Angle BAC = Angle ABD."

Answer 1

HELP PLEASE !

Answer 2

Nowhere in the picture does it say that AB = BC. See if there's a step that assumes they are equal.

Answer 3

to me, at the first line, \(\angle\)ABC = \(\angle\)BCD , not \(\angle\) DBC

Answer 4

hihihi. anyway, DDCamp and me interpret the same flaw in different ways

Answer 5

@Loser66 I dont get this !

Answer 6

ok i see

Answer 7

gotta go, good luck

Answer 8

Thanks @Loser66