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# What are the Triangle numbers up to 21?

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# What are triangle numbers?

Triangle numbers are a series of sums of the first n numbers. Thus T1 = 1 T2 = 1+2 = 3 T3 = 1+2+3 = 6 T4 = 1+2+3+4 = 10 However, rather than ading up a whole lot of numbers,

# What are all the prime numbers up to 21?

  2, 3, 5, 7, 11, 13, 17, and 19.

# What are the triangle numbers up to 50?

3,6,10,15,21,28,36,45,55

20 and 1

(n^2+n)/2

10 & 11

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# What numbers add up to 21 that have 1 digit?

1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1 is one example.

# What is the fewest number of triangles that make up a trapezoid?

The fewest number of triangles that make up a trapezoid are two  isosceles triangles.

# How many degrees does a triangle add up to with only 1 number?

you would do that number plus any letter. than after you woul subtract say 30 and 30+n=180-30 and thats your answer.

5+5+5+5+1

20 and 1

# What are 3 prime numbers that add up to 21?

3, 5, 13 is one possible triplet.
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# Which numbers can make up a perimeter 10 for a triangle?

You can choose any three numbers that total 10, but the sum of any two of those numbers must be greater than the third number. For example, Isosceles triangles : 3,3,4 : 4,4,2

# How can numbers 1-9 add up to 15 on each side of the triangle?

The numbers 1-9 sum to 45. If they are to be sum to 15 on each of three sides of a triangle, no number can be counted more than once (15*3 = 45). That is, there are no numbe

6 and 15
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# Three numbers in GP sum up to 21. Their product is 216. Find the numbers?

3 + 6 + 12 = 21 3 x 6 x 12 = 216