The sum of any two consecutive triangular numbers is a square number.
True
False
Which of the following is a triangular number?
4
5
6
7
Match the patterns with their units of repeat.
2 3 5 2 3 5 2 3 5
A C E A C E A C E
A B C A B C A B C
A B C D A B C D
2 3 4 5 2 3 4 5
2 3 5
A C E
A B C
A B C D
2 3 4 5
triangular numbers
square numbers
rectangular numbers