Lake or pond

The landlord has a square lake. Trees grow around this lake. The lake wants to enlarge the pond twice and not cut down or flood any tree.

How will he do that?

Correct answer:

x =  0

Step-by-step explanation:

S1=a2 S2=πr2  2 S1=S2 2 a2=πr2  r=a 2/π  h2=2 h1 x=0

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