Here is a triangular number. It is the number 36.
I learned that some triangular numbers and square numbers are the same, for example 36 a triangular number and a square number - Tom.
I never that 36 was a square number and a triangular number - Iain.
We also talked about Pi. Pi is a number that is used to calculate the area and perimeter of circles - Jilun.
I learned that 100 isn't a triangular number but it is a square number - Ellen.
I learned that triangular numbers can keep going to infinity but not all numbers are triangular numbers. - Kyle
I learned that some square numbers are triangular numbers. - Zak