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A square whose diagonal is 10 cm long has an area equal to

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None of these

answer is C.

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Detailed Solution

Concept: All sides are equal in a square.
Diagonals in a square are also equal and bisect at right angles.
Formula to find the length of diagonal in a square =

Area of square =

From the above calculation we know that

Therefore, area of the square is

We can also calculate it in other way-
Question Image

Hence, the correct answer is option 3.

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