# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 7.21   b = 5.1   c = 3.16

Area: T = 6.99767389357
Perimeter: p = 15.47
Semiperimeter: s = 7.735

Angle ∠ A = α = 119.7398636512° = 119°44'19″ = 2.0989833449 rad
Angle ∠ B = β = 37.89331470309° = 37°53'35″ = 0.66113601796 rad
Angle ∠ C = γ = 22.36882164575° = 22°22'6″ = 0.3990399025 rad

Height: ha = 1.9410842978
Height: hb = 2.74438191905
Height: hc = 4.42883157821

Median: ma = 2.23664648443
Median: mb = 4.94879642278
Median: mc = 6.04215767809

Inradius: r = 0.90545557771
Circumradius: R = 4.15218041858

Vertex coordinates: A[3.16; 0] B[0; 0] C[5.69898259494; 4.42883157821]
Centroid: CG[2.95499419831; 1.47661052607]
Coordinates of the circumscribed circle: U[1.58; 3.83994111524]
Coordinates of the inscribed circle: I[2.635; 0.90545557771]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 60.26113634884° = 60°15'41″ = 2.0989833449 rad
∠ B' = β' = 142.1076852969° = 142°6'25″ = 0.66113601796 rad
∠ C' = γ' = 157.6321783543° = 157°37'54″ = 0.3990399025 rad

# How did we calculate this triangle?

### 1. The triangle circumference is the sum of the lengths of its three sides ### 2. Semiperimeter of the triangle ### 3. The triangle area using Heron's formula ### 4. Calculate the heights of the triangle from its area. ### 5. Calculation of the inner angles of the triangle using a Law of Cosines    