Question

Please include what axioms and theorems were used as well.

Answer 1

Hey!

In △ABD and△BAC,

AD = BC (it's given)

∠DAB = ∠CBA (it's given)

AB = BA (Common)

By SAS congruence rule,

∴△ABD≅△BAC

=> BD = AC (By C.P.C.T) (ii)

And, ∠ABD = ∠BAC (By C.P.C.T) (iii)

Hope it helps, any confusions you may ask.

Answer 2

Part (i)

1. ABCD is a quadrilateral in which AD=BC and ∠DAB=∠CBA (given)

2. AB = AB (reflexive property)

3. Triangles ABD and BAC are congruent (SAS)

Part (ii)

4. BD=AC (corresponding sides of congruent triangles are equal)

Part (iii)

5. ∠ABD = ∠BAC (corresponding angles of congruent triangles are equal)