What is 2 1/3 rounded to the nearest whole number?

The answer is 2. When you round a mixed number to the nearest whole number, look at the fraction part. If the fraction is less than 1/2, you have to round down. If the fraction is greater than or equal to 1/2, you round up. So look, 1/3 is less than 1/2 so we round that down. It just becomes 2.

The next larger whole number is 3.
The next smaller one is 2.
2-1/3 us closer to 2 than to 3.
So the nearest whole number is 2.

Use pythagorean’s theorem and find the missing side lengths of the two smaller triangles and add them together
13^2 - 12^2 = 5
15^2 - 12^2 = 9
5+9 = 14
14 is the length of each side of the square
14^2 + 14^2 = 19.8
19.8 is the diagonal length of the inside if the square