# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 6   b = 20   c = 21

Area: T = 59.98769777535
Perimeter: p = 47
Semiperimeter: s = 23.5

Angle ∠ A = α = 16.59878421359° = 16°35'52″ = 0.2989686994 rad
Angle ∠ B = β = 72.2088409427° = 72°12'30″ = 1.26602744921 rad
Angle ∠ C = γ = 91.19437484371° = 91°11'37″ = 1.59216311675 rad

Height: ha = 19.99656592512
Height: hb = 5.99986977754
Height: hc = 5.71330455003

Median: ma = 20.28554627751
Median: mb = 11.76986022959
Median: mc = 10.3880269746

Inradius: r = 2.55326373512
Circumradius: R = 10.50222793878

Vertex coordinates: A[21; 0] B[0; 0] C[1.83333333333; 5.71330455003]
Centroid: CG[7.61111111111; 1.90443485001]
Coordinates of the circumscribed circle: U[10.5; -0.21987974872]
Coordinates of the inscribed circle: I[3.5; 2.55326373512]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 163.4022157864° = 163°24'8″ = 0.2989686994 rad
∠ B' = β' = 107.7921590573° = 107°47'30″ = 1.26602744921 rad
∠ C' = γ' = 88.80662515629° = 88°48'23″ = 1.59216311675 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 ### 6. Inradius ### 7. Circumradius ### 8. Calculation of medians #### Look also our friend's collection of math examples and problems:

See more informations about triangles or more information about solving triangles.