15 15 22 triangle
Obtuse isosceles triangle.
Sides: a = 15 b = 15 c = 22Area: T = 112.1788429299
Perimeter: p = 52
Semiperimeter: s = 26
Angle ∠ A = α = 42.83334280661° = 42°50' = 0.74875843497 rad
Angle ∠ B = β = 42.83334280661° = 42°50' = 0.74875843497 rad
Angle ∠ C = γ = 94.33331438679° = 94°19'59″ = 1.64664239543 rad
Height: ha = 14.95771239065
Height: hb = 14.95771239065
Height: hc = 10.19880390272
Median: ma = 17.27699160392
Median: mb = 17.27699160392
Median: mc = 10.19880390272
Inradius: r = 4.3154554973
Circumradius: R = 11.03215326015
Vertex coordinates: A[22; 0] B[0; 0] C[11; 10.19880390272]
Centroid: CG[11; 3.39993463424]
Coordinates of the circumscribed circle: U[11; -0.83334935743]
Coordinates of the inscribed circle: I[11; 4.3154554973]
Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 137.1676571934° = 137°10' = 0.74875843497 rad
∠ B' = β' = 137.1676571934° = 137°10' = 0.74875843497 rad
∠ C' = γ' = 85.66768561321° = 85°40'1″ = 1.64664239543 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
