Question

Triangle congruence and similarity

Answer 1

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."

Answer 2

@ganeshie8 I don't get this one ;/