Solved UPSC CDS/OTA Question
A solved UPSC CDS/OTA PYQ - decoded step-by-step.
Solve it the standard way once - then learn the shortcut.
Q · GeometryMedium · 45s
TopicGeometry
Question Typemultiple choice
DifficultyMedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained - no skipped algebra.
ΔAEC is an equilateral triangle
∠EAC = 180° – (90° + 20°) = 70°
In ΔABD ∠BDA = 180° – (50° + 70°)
= 180° – 120°
= ∠BDA = 60°
Final Answer: Option B - 60°