8 8 10 triangle
Acute isosceles triangle.
Sides: a = 8 b = 8 c = 10Area: T = 31.2254989992
Perimeter: p = 26
Semiperimeter: s = 13
Angle ∠ A = α = 51.31878125465° = 51°19'4″ = 0.89656647939 rad
Angle ∠ B = β = 51.31878125465° = 51°19'4″ = 0.89656647939 rad
Angle ∠ C = γ = 77.3644374907° = 77°21'52″ = 1.35502630659 rad
Height: ha = 7.8066247498
Height: hb = 7.8066247498
Height: hc = 6.24549979984
Median: ma = 8.12440384046
Median: mb = 8.12440384046
Median: mc = 6.24549979984
Inradius: r = 2.40219223071
Circumradius: R = 5.12441009218
Vertex coordinates: A[10; 0] B[0; 0] C[5; 6.24549979984]
Centroid: CG[5; 2.08216659995]
Coordinates of the circumscribed circle: U[5; 1.12108970766]
Coordinates of the inscribed circle: I[5; 2.40219223071]
Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 128.6822187453° = 128°40'56″ = 0.89656647939 rad
∠ B' = β' = 128.6822187453° = 128°40'56″ = 0.89656647939 rad
∠ C' = γ' = 102.6365625093° = 102°38'8″ = 1.35502630659 rad
Calculate another triangle
How did we calculate this triangle?
Now we know the lengths of all three sides of the triangle and the triangle is uniquely determined. Next we calculate another its characteristics - same procedure as calculation of the triangle from the known three sides SSS.
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
