# Triangle calculator SSS - result

Please enter the triangle sides:

### Acute isosceles triangle.

Sides: a = 4   b = 18   c = 18

Area: T = 35.777708764
Perimeter: p = 40
Semiperimeter: s = 20

Angle ∠ A = α = 12.75987404169° = 12°45'31″ = 0.22326820287 rad
Angle ∠ B = β = 83.62106297916° = 83°37'14″ = 1.45994553125 rad
Angle ∠ C = γ = 83.62106297916° = 83°37'14″ = 1.45994553125 rad

Height: ha = 17.889854382
Height: hb = 3.975523196
Height: hc = 3.975523196

Median: ma = 17.889854382
Median: mb = 9.43439811321
Median: mc = 9.43439811321

Inradius: r = 1.7898854382
Circumradius: R = 9.05660753089

Vertex coordinates: A[18; 0] B[0; 0] C[0.44444444444; 3.975523196]
Centroid: CG[6.14881481481; 1.325507732]
Coordinates of the circumscribed circle: U[9; 1.00662305899]
Coordinates of the inscribed circle: I[2; 1.7898854382]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 167.2411259583° = 167°14'29″ = 0.22326820287 rad
∠ B' = β' = 96.37993702084° = 96°22'46″ = 1.45994553125 rad
∠ C' = γ' = 96.37993702084° = 96°22'46″ = 1.45994553125 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.