# Triangle calculator SSS - result

Please enter the triangle sides:

### Acute isosceles triangle.

Sides: a = 66.18   b = 66.18   c = 25.82

Area: T = 837.9769821739
Perimeter: p = 158.18
Semiperimeter: s = 79.09

Angle ∠ A = α = 78.75109511367° = 78°45'3″ = 1.37444633864 rad
Angle ∠ B = β = 78.75109511367° = 78°45'3″ = 1.37444633864 rad
Angle ∠ C = γ = 22.49880977266° = 22°29'53″ = 0.39326658808 rad

Height: ha = 25.32439595569
Height: hb = 25.32439595569
Height: hc = 64.90985841781

Median: ma = 37.79326487561
Median: mb = 37.79326487561
Median: mc = 64.90985841781

Inradius: r = 10.59551425179
Circumradius: R = 33.73881600251

Vertex coordinates: A[25.82; 0] B[0; 0] C[12.91; 64.90985841781]
Centroid: CG[12.91; 21.6366194726]
Coordinates of the circumscribed circle: U[12.91; 31.1770424153]
Coordinates of the inscribed circle: I[12.91; 10.59551425179]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 101.2499048863° = 101°14'57″ = 1.37444633864 rad
∠ B' = β' = 101.2499048863° = 101°14'57″ = 1.37444633864 rad
∠ C' = γ' = 157.5021902273° = 157°30'7″ = 0.39326658808 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.