# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 2.5   b = 3.74   c = 2.78

Area: T = 3.47549992388
Perimeter: p = 9.02
Semiperimeter: s = 4.51

Angle ∠ A = α = 41.94774744169° = 41°56'51″ = 0.73221215415 rad
Angle ∠ B = β = 90.03879223892° = 90°2'17″ = 1.57114581973 rad
Angle ∠ C = γ = 48.01546031939° = 48°53″ = 0.83880129148 rad

Height: ha = 2.78799993911
Height: hb = 1.8588288363
Height: hc = 2.54999994524

Median: ma = 3.04988522431
Median: mb = 1.86987696487
Median: mc = 2.86112409895

Inradius: r = 0.77105098091
Circumradius: R = 1.87700004096

Vertex coordinates: A[2.78; 0] B[0; 0] C[-0.00216546763; 2.54999994524]
Centroid: CG[0.92661151079; 0.83333331508]
Coordinates of the circumscribed circle: U[1.39; 1.2510920274]
Coordinates of the inscribed circle: I[0.77; 0.77105098091]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 138.0532525583° = 138°3'9″ = 0.73221215415 rad
∠ B' = β' = 89.96220776108° = 89°57'43″ = 1.57114581973 rad
∠ C' = γ' = 131.9855396806° = 131°59'7″ = 0.83880129148 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    