Math formula

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Last updated 3:16 AM on 4/11/26
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10 Terms

1
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pentagonal number

n(3n-1) / 2

2
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triangular number

n(n+1) / 2

3
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hexagonal number

n(2n - 1)

4
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volume of tetrahedron

n³sqrt(2) / 12

5
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area of ellipse

pi x ab, where a is the semi-major arc and b is the semi-minor arc

6
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number of diagonals formula

n(n - 3) / 2

7
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octagonal number

n(3n - 2) / 2

8
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octahedral volume

sqrt(2) / 3 x a³

9
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Simple Interest

PRT

10
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Compound interest

P(1+r)^t