Question

What square will we get if we add 15th and 16th triangular numbers

Answer 1

Answer:

181.37

Step-by-step explanation:

By simple formula, you can know the nth triangular number

n(n+1)/2

similarly, the 15th triangular number is

15(15+1)/2= 120

and 16th triangular number is

16(16+1)/2= 136

√(120x120 +136x136) = √32896