i cannot understand the part of square.

 

vidvenkat

We know that diagonals of a square divide it into 4 concurent triangles.

 

 

⇒ ∆AOB ≅ ∆BOC ≅ ∆COD ≅ ∆DOA

⇒ Area (∆AOB) = Area (∆BOC)  = Area (∆COD) = Area (∆DOA)

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