Triangle calculator SSS - result

Please enter the triangle sides:


Obtuse scalene triangle.

Sides: a = 6   b = 12   c = 14

Area: T = 35.777708764
Perimeter: p = 32
Semiperimeter: s = 16

Angle ∠ A = α = 25.20987652968° = 25°12'32″ = 0.44399759548 rad
Angle ∠ B = β = 58.41218644948° = 58°24'43″ = 1.01994793577 rad
Angle ∠ C = γ = 96.37993702084° = 96°22'46″ = 1.68221373411 rad

Height: ha = 11.926569588
Height: hb = 5.963284794
Height: hc = 5.111101252

Median: ma = 12.68985775404
Median: mb = 8.944427191
Median: mc = 6.40331242374

Inradius: r = 2.23660679775
Circumradius: R = 7.04436141291

Vertex coordinates: A[14; 0] B[0; 0] C[3.14328571429; 5.111101252]
Centroid: CG[5.71442857143; 1.704367084]
Coordinates of the circumscribed circle: U[7; -0.78326237921]
Coordinates of the inscribed circle: I[4; 2.23660679775]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 154.7911234703° = 154°47'28″ = 0.44399759548 rad
∠ B' = β' = 121.5888135505° = 121°35'17″ = 1.01994793577 rad
∠ C' = γ' = 83.62106297916° = 83°37'14″ = 1.68221373411 rad

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How did we calculate this triangle?

a = 6 ; ; b = 12 ; ; c = 14 ; ;

1. The triangle circumference is the sum of the lengths of its three sides

p = a+b+c = 6+12+14 = 32 ; ;

2. Semiperimeter of the triangle

s = fraction{ o }{ 2 } = fraction{ 32 }{ 2 } = 16 ; ;

3. The triangle area using Heron's formula

T = sqrt{ s(s-a)(s-b)(s-c) } ; ; T = sqrt{ 16 * (16-6)(16-12)(16-14) } ; ; T = sqrt{ 1280 } = 35.78 ; ;

4. Calculate the heights of the triangle from its area.

T = fraction{ a h _a }{ 2 } ; ; h _a = fraction{ 2 T }{ a } = fraction{ 2 * 35.78 }{ 6 } = 11.93 ; ; h _b = fraction{ 2 T }{ b } = fraction{ 2 * 35.78 }{ 12 } = 5.96 ; ; h _c = fraction{ 2 T }{ c } = fraction{ 2 * 35.78 }{ 14 } = 5.11 ; ;

5. Calculation of the inner angles of the triangle using a Law of Cosines

a**2 = b**2+c**2 - 2bc cos alpha ; ; alpha = arccos( fraction{ b**2+c**2-a**2 }{ 2bc } ) = arccos( fraction{ 12**2+14**2-6**2 }{ 2 * 12 * 14 } ) = 25° 12'32" ; ; b**2 = a**2+c**2 - 2ac cos beta ; ; beta = arccos( fraction{ a**2+c**2-b**2 }{ 2ac } ) = arccos( fraction{ 6**2+14**2-12**2 }{ 2 * 6 * 14 } ) = 58° 24'43" ; ; gamma = 180° - alpha - beta = 180° - 25° 12'32" - 58° 24'43" = 96° 22'46" ; ;

6. Inradius

T = rs ; ; r = fraction{ T }{ s } = fraction{ 35.78 }{ 16 } = 2.24 ; ;

7. Circumradius

R = fraction{ a }{ 2 * sin alpha } = fraction{ 6 }{ 2 * sin 25° 12'32" } = 7.04 ; ;

8. Calculation of medians

m_a = fraction{ sqrt{ 2 b**2+2c**2 - a**2 } }{ 2 } = fraction{ sqrt{ 2 * 12**2+2 * 14**2 - 6**2 } }{ 2 } = 12.689 ; ; m_b = fraction{ sqrt{ 2 c**2+2a**2 - b**2 } }{ 2 } = fraction{ sqrt{ 2 * 14**2+2 * 6**2 - 12**2 } }{ 2 } = 8.944 ; ; m_c = fraction{ sqrt{ 2 b**2+2a**2 - c**2 } }{ 2 } = fraction{ sqrt{ 2 * 12**2+2 * 6**2 - 14**2 } }{ 2 } = 6.403 ; ;
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