Triangle calculator SSS - result

Please enter the triangle sides:

Acute isosceles triangle.

Sides: a = 5   b = 26   c = 26

Area: T = 64.6998821473
Perimeter: p = 57
Semiperimeter: s = 28.5

Angle ∠ A = α = 11.03554687476° = 11°2'8″ = 0.19326052641 rad
Angle ∠ B = β = 84.48222656262° = 84°28'56″ = 1.47444936947 rad
Angle ∠ C = γ = 84.48222656262° = 84°28'56″ = 1.47444936947 rad

Height: ha = 25.88795285892
Height: hb = 4.9776832421
Height: hc = 4.9776832421

Median: ma = 25.88795285892
Median: mb = 13.47221935853
Median: mc = 13.47221935853

Inradius: r = 2.27701340868
Circumradius: R = 13.06105161077

Vertex coordinates: A[26; 0] B[0; 0] C[0.48107692308; 4.9776832421]
Centroid: CG[8.82769230769; 1.65989441403]
Coordinates of the circumscribed circle: U[13; 1.25658188565]
Coordinates of the inscribed circle: I[2.5; 2.27701340868]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 168.9654531252° = 168°57'52″ = 0.19326052641 rad
∠ B' = β' = 95.51877343738° = 95°31'4″ = 1.47444936947 rad
∠ C' = γ' = 95.51877343738° = 95°31'4″ = 1.47444936947 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     