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Because it can be arranged in a triangle. Think of a set of Bowling pins. 1 followed by 2 followed by 3 followed by 4

1, 3, 6 and 10 (the totals including each row) are the first four triangle numbers.

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Q: Why is the number 10 a triangle number?
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Related questions

Why is 10 called a triangular number?

A triangular number or triangle number counts the objects that can form an equilateral triangle. 10 objects can be formed into an equilateral triangle.


Is 12 a triangle number?

No but 10 and 15 are :D


Triangle abc is an equilateral triangle bc equals 10 what is the length of ad give your answer to the nearest whole number?

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What number is a square and triangle number?

36 is both a square number and a triangle number as it is:6x6=36andthe square numbers are:1, 3, 6, 10, 15, 21, 28, 36, 45,55, 66, 78.xx


Triangle ABC is an equilateral triangle. BC 10 What is the length of AD Give you answer to the nearest whole number?

That depends on what is meant by length of AD but the 3 sides of an equilateral triangle are all equal in lengths.


Triangle number of 28?

28 is a triangle number. The 28th triangle number is 406.


What is the triangle number of 13?

The triangle number of 13 can be calculated using the formula n(n+1)/2, where n is the number you are finding the triangle number of. In this case, n is 13. Plugging 13 into the formula, we get 13(13+1)/2 = 13(14)/2 = 182/2 = 91. Therefore, the triangle number of 13 is 91.


What is the third triangular number?

If I remember correctly, the triangle numbers are 1, 3, 6, 10, 15... It is like racking up billiard balls or bowling pins. If the first number is 1, then the 3rd number is 6.


Could this number be a side lengths of a triangle the number are 6 8 10?

Yes, and it would have to be a right angled triangle as the sides are in ratio 3:4:5 6^2 + 8^2 = 36 + 64 = 100 = 10^2 . Good old Pythagoras!


What is the third triangle number?

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Is a triangle with sides 10 14 10 obtuse acute or right?

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How many triangles are in a 10 x 10 x 10 triangle puzzle?

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