Question

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?

• A. 100
• B. 275
• C. 225
• D. 125

Answer 1

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: ${\frac{n(n+1)}{2}}^2=100$