**Concept: The question tests on basic Geometry**

**Solution:**

Area of a square of side a = a^2 = 36.

Therefore side of the square = 6

Length of the diagonal is a√2=6√2**Option D**

Modified on: Tue, 12 Oct, 2021 at 2:16 PM

**Concept: The question tests on basic Geometry**

**Solution:**

Area of a square of side a = a^2 = 36.

Therefore side of the square = 6

Length of the diagonal is a√2=6√2**Option D**

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