Solution
Let the side of square = $$s$$ cm and diagonal, $$d = 10$$ cm
=> $$(s)^2 + (s)^2 = (d)^2$$
=> $$2s^2 = (10)^2 = 100$$
=> $$s^2 = \frac{100}{2} = 50$$
$$\therefore$$ Area of square = $$s^2 = 50 cm^2$$
=> Ans - (A)
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