# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 71.8   b = 46.15   c = 55

Area: T = 1269.125499571
Perimeter: p = 172.95
Semiperimeter: s = 86.475

Angle ∠ A = α = 90.00547121024° = 90°17″ = 1.57108785685 rad
Angle ∠ B = β = 39.998775982° = 39°59'52″ = 0.69880926023 rad
Angle ∠ C = γ = 49.99875280776° = 49°59'51″ = 0.87326214828 rad

Height: ha = 35.35216711896
Height: hb = 554.999999814
Height: hc = 46.15499998439

Median: ma = 35.89770925006
Median: mb = 59.64661597674
Median: mc = 53.72441216773

Inradius: r = 14.67662069466
Circumradius: R = 35.99000001214

Vertex coordinates: A[55; 0] B[0; 0] C[55.00437954545; 46.15499998439]
Centroid: CG[36.66879318182; 15.38333332813]
Coordinates of the circumscribed circle: U[27.5; 23.07772617248]
Coordinates of the inscribed circle: I[40.325; 14.67662069466]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 89.99552878976° = 89°59'43″ = 1.57108785685 rad
∠ B' = β' = 140.002224018° = 140°8″ = 0.69880926023 rad
∠ C' = γ' = 130.0022471922° = 130°9″ = 0.87326214828 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    