Question

Observe the rectangle given below

If we have to make a square by rearranging the dots, then what is the minimum number of dots that has to added?

• A. 4
• B. 16
• C. 8
• D. 2

Answer 1

The correct option is A

4

We have a rectangle of side $4\times 3$

Total number of dots $=4\times 3=12$

Now, 12 can be written as

$12=16-4$

$12=(4{)}^2-4$

So, we can get a square of side 4 and for that 4 extra dots needs to be added.