# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 16   b = 17   c = 26

Area: T = 131.9987869301
Perimeter: p = 59
Semiperimeter: s = 29.5

Angle ∠ A = α = 36.67550126606° = 36°40'30″ = 0.64400997241 rad
Angle ∠ B = β = 39.39107046527° = 39°23'27″ = 0.68774974909 rad
Angle ∠ C = γ = 103.9344282687° = 103°56'3″ = 1.81439954386 rad

Height: ha = 16.54997336626
Height: hb = 15.52991610942
Height: hc = 10.15436822539

Median: ma = 20.45772725455
Median: mb = 19.8433134833
Median: mc = 10.17334949747

Inradius: r = 4.47545040441
Circumradius: R = 13.39441555978

Vertex coordinates: A[26; 0] B[0; 0] C[12.36553846154; 10.15436822539]
Centroid: CG[12.78884615385; 3.38545607513]
Coordinates of the circumscribed circle: U[13; -3.22554308517]
Coordinates of the inscribed circle: I[12.5; 4.47545040441]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 143.3254987339° = 143°19'30″ = 0.64400997241 rad
∠ B' = β' = 140.6099295347° = 140°36'33″ = 0.68774974909 rad
∠ C' = γ' = 76.06657173133° = 76°3'57″ = 1.81439954386 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   