# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse isosceles triangle.

Sides: a = 140   b = 140   c = 263.11

Area: T = 6299.93552769
Perimeter: p = 543.11
Semiperimeter: s = 271.555

Angle ∠ A = α = 20.00223534388° = 20°8″ = 0.34991069257 rad
Angle ∠ B = β = 20.00223534388° = 20°8″ = 0.34991069257 rad
Angle ∠ C = γ = 139.9955293122° = 139°59'43″ = 2.44333788023 rad

Height: ha = 89.99990753843
Height: hb = 89.99990753843
Height: hc = 47.88882237612

Median: ma = 198.7879868322
Median: mb = 198.7879868322
Median: mc = 47.88882237612

Inradius: r = 23.19994817879
Circumradius: R = 204.6433213515

Vertex coordinates: A[263.11; 0] B[0; 0] C[131.555; 47.88882237612]
Centroid: CG[131.555; 15.96327412537]
Coordinates of the circumscribed circle: U[131.555; -156.7554989754]
Coordinates of the inscribed circle: I[131.555; 23.19994817879]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 159.9987646561° = 159°59'52″ = 0.34991069257 rad
∠ B' = β' = 159.9987646561° = 159°59'52″ = 0.34991069257 rad
∠ C' = γ' = 40.00547068775° = 40°17″ = 2.44333788023 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    