- A180°
- B45°
- C60°
- D90°
Step-by-Step Solution
△ABD ≅ △ACD (SAS), so ∠ADB = ∠ADC by CPCT. They form a linear pair, so each is 90°.
Answer: D) 90°
In isosceles △ABC (AB = AC), the bisector of ∠A meets BC at D. What is ∠ADB?
Class 9SAS, ASA and AAS CongruenceGeometry — Triangles
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