Q:
# What are triangular numbers?

**A triangular number is one that can be represented as a regular, triangle-shaped grid of equally spaced points having one element in the first row and an additional element in each row thereafter, according to Wolfram MathWorld.** So the second row has two elements, the third row has three, etc.

Credit:
Caspar Benson
Getty Images

The first element in the first row represents the first triangular number. The three elements in the first two rows constitute the second triangular number. They are added to the three elements in the third row to obtain the next triangular number, which is six. Those six are added to the four points in the fourth row, resulting in a total of ten, which is the next triangular number. This same pattern continues to repeat itself so that the first twelve triangular numbers are 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66 and 78.

Learn more about Numbers-
Q:
## Is pi a real number?

A: Pi is a real number, as all numbers that exist on a number line are real. Real numbers include all rational and irrational numbers; pi is defined as an irr... Full Answer >Filed Under: -
Q:
## What does "short word form" refer to in math?

A: In mathematics, the short word form is created by writing a large number using a combination of numbers and words. For instance, the short word form of 785... Full Answer >Filed Under: -
Q:
## What are some facts about the number 16?

A: The number 16 is an even number and is the only integer that has the form xy=yx, where x and y are different numbers (2 and 4). Another fact is that the ba... Full Answer >Filed Under: -
Q:
## What are all the common multiples for 7 and 11 from 1 to 100?

A: The only common multiple of the numbers 7 and 11 from 1 to 100 is the number 77, according to the Math Warehouse calculator. A multiple is the product of a... Full Answer >Filed Under: