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# Public Formula Library

### TRIANGLE

Just for viewing purposes. You can store and calculate this formula only inside the application.

### Formula name

TRIANGLE

### Description

general principles

### Syntax

a = b * SIN(α) / SIN(β)

R = a / (2 * SIN(α))

c = SQRT( a^2 + b^2 - 2*a*b*COS([π] - α - β))

A = 1/2 * b * c * SIN(α)

s = 1/2 * (a + b + c)

ri = A / s

R = a / (2 * SIN(α))

c = SQRT( a^2 + b^2 - 2*a*b*COS([π] - α - β))

A = 1/2 * b * c * SIN(α)

s = 1/2 * (a + b + c)

ri = A / s

### Notes

"R" means the radius of the circumscribed circle of the triangle and "A" means the area of the triangle.

" ri " stands for the radius of the inner circle of the triangle.

"s" means half of the perimeter of the triangle.

" ri " stands for the radius of the inner circle of the triangle.

"s" means half of the perimeter of the triangle.

### Category / Subcategory

Mathematics / Trigonometry

### Creator

Physics@abacal.com

### Account

Free

### Tags

formula triangle

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