# Triangle calculator SSS - result

Please enter the triangle sides:

### Acute isosceles triangle.

Sides: a = 5   b = 8   c = 8

Area: T = 18.9988355192
Perimeter: p = 21
Semiperimeter: s = 10.5

Angle ∠ A = α = 36.42199137286° = 36°25'12″ = 0.63656474079 rad
Angle ∠ B = β = 71.79900431357° = 71°47'24″ = 1.25329726229 rad
Angle ∠ C = γ = 71.79900431357° = 71°47'24″ = 1.25329726229 rad

Height: ha = 7.59993420768
Height: hb = 4.7549588798
Height: hc = 4.7549588798

Median: ma = 7.59993420768
Median: mb = 5.3398539126
Median: mc = 5.3398539126

Inradius: r = 1.80993671611
Circumradius: R = 4.21108908477

Vertex coordinates: A[8; 0] B[0; 0] C[1.56325; 4.7549588798]
Centroid: CG[3.18875; 1.5833196266]
Coordinates of the circumscribed circle: U[4; 1.31659033899]
Coordinates of the inscribed circle: I[2.5; 1.80993671611]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 143.5880086271° = 143°34'48″ = 0.63656474079 rad
∠ B' = β' = 108.2109956864° = 108°12'36″ = 1.25329726229 rad
∠ C' = γ' = 108.2109956864° = 108°12'36″ = 1.25329726229 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.