# Triangle calculator SSS - result

Please enter the triangle sides:

### Right scalene triangle.

Sides: a = 15   b = 36   c = 39

Area: T = 270
Perimeter: p = 90
Semiperimeter: s = 45

Angle ∠ A = α = 22.6219864948° = 22°37'11″ = 0.39547911197 rad
Angle ∠ B = β = 67.3880135052° = 67°22'49″ = 1.17660052071 rad
Angle ∠ C = γ = 90° = 1.57107963268 rad

Height: ha = 36
Height: hb = 15
Height: hc = 13.84661538462

Median: ma = 36.77329520164
Median: mb = 23.43107490277
Median: mc = 19.5

Inradius: r = 6
Circumradius: R = 19.5

Vertex coordinates: A[39; 0] B[0; 0] C[5.76992307692; 13.84661538462]
Centroid: CG[14.92330769231; 4.61553846154]
Coordinates of the circumscribed circle: U[19.5; -0]
Coordinates of the inscribed circle: I[9; 6]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 157.3880135052° = 157°22'49″ = 0.39547911197 rad
∠ B' = β' = 112.6219864948° = 112°37'11″ = 1.17660052071 rad
∠ C' = γ' = 90° = 1.57107963268 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    