Q. On a plane, there are 5 parallel and equidistant horizontal lines and 5 parallel and equidistant vertical lines. How many rectangles and squares are made by these lines?

100

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275

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225

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125

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Solution

The correct option is A 100
Here, n = 4, as 4 squares will be formed in each row and each column of this square matrix.

No. of square and rectangles: ${\frac{n (n + 1)}{2}}^{2} = 100$

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