SOLUTION: can you please help me with this? I need to know how to column proof this. Given: ∠BAD≅∠CAD AD ⟘ BC Prove: ΔABC is isosceles

∠BAD ≅ ∠CAD          |  given
  AD ≅ AD             |  reflexive property of congruence
∠BDA is a right angle |  AD ⟘ BC is given
∠CDA is a right angle |  AD ⟘ BC is given
∠BDA ≅ ∠CDA          |  all right angles are congruent.
ΔADB ≅ ΔADC           |  angle-side-angle
  AB ≅ AC             |  corr. parts of congruent triangles
ΔABC is isosceles     |  ΔABC has two congruent sides 

Edwin