Question

Observe the given rectangle

How many minimum extra dots we need to add and make it a square.

• A. 4
• B. 5
• C. 6
• D. 10

Answer 1

The correct option is B

5

We can observe from the figure that the rectangle has $5\times 4=20\text{dots}$

For a square, we must have an equal number of rows and columns.

To make it a square, we need to give one extra row, i.e., we need 5 extra dots.