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13 is not a triangle number. The 13th triangle number is 91.

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The 13th triangular number is 13*14/2 = 91.

Q: What is the triangle number of 13?

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It is: 0.5*13*6 = 45 square units

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

13 units squared.

The third triangle number is 6.

Using 1-6 can a magic triangle have a sum of 13

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Yes, it is the 13th triangle number (13 levels from 1 to 13 dots).

Click the numbers to display "453" (the number of sides to square, pentagon, triangle).

Click the numbers to display "453" (the number of sides to square, pentagon, triangle).

Answer: Right Triangle Note that 25+144=169 which is 13 squared. This tells us it is a right triangle.

Click the numbers to display "453" (the number of sides to square, pentagon, triangle).

It is: 0.5*13*6 = 45 square units

Click the numbers to display "453" (the number of sides to square, pentagon, triangle).

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

The perimeter of the triangle is: 13+12+5 = 30 inches

13 units squared.

The third triangle number is 6.

The Triangle of Death was created on 2009-05-13.