ABCD is a square field with AB = x. A vertical pole OP of height 2x stands at the centre O of the square field. If ∠APO = θ, then what is cot θ equal to ? 

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CDS Elementary Mathematics 16 April 2023 Official Paper
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  1. √2
  2. 2
  3. 2√2
  4. 3√2

Answer (Detailed Solution Below)

Option 3 : 2√2
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Detailed Solution

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Given:

AB = x

∠APO = θ

Concept used:

Diagonal of square = √2a

cotθ = base/perpendicular

Calculation:

According to the above concept,

Diagonal of square = √2a

⇒ AC = x√2

⇒ OA =  = 

Now, according to the above figure,

In ΔOAP,

⇒ cotθ =  = 

⇒ cotθ = 2√2

∴ The required value of cotθ is 2√2

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