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△ ABC is an isosceles triangle with AB ¯¯¯¯¯¯≅ AC¯¯¯¯¯¯.
​
​ AN¯¯¯¯¯ ⊥ BC¯¯¯¯¯
​Prove that Part A
The first step in proving ​ ≅ ΔABN ≅ ΔACN. Using the given and the fact that AN¯¯¯¯¯ ≅ AN¯¯¯¯¯, this can be proved using which theorem?

Answer :

QuinnieL

Answer:

SAA

Step-by-step explanation:

angle ABC = angle ACB ( base of isos. tri.)

since AB = AC, angle BNA = angle CNA = 90°

therefore tri ABN = tri ACN (by SAA congruency)

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