26 28 28 triangle

Acute isosceles triangle.

Sides: a = 26   b = 28   c = 28

Area: T = 322.3989515959
Perimeter: p = 82
Semiperimeter: s = 41

Angle ∠ A = α = 55.32880089924° = 55°19'41″ = 0.96656559255 rad
Angle ∠ B = β = 62.33659955038° = 62°20'10″ = 1.0887968364 rad
Angle ∠ C = γ = 62.33659955038° = 62°20'10″ = 1.0887968364 rad

Height: ha = 24.79991935353
Height: hb = 23.02878225685
Height: hc = 23.02878225685

Median: ma = 24.79991935353
Median: mb = 23.10884400166
Median: mc = 23.10884400166

Vertex coordinates: A[28; 0] B[0; 0] C[12.07114285714; 23.02878225685]
Centroid: CG[13.35771428571; 7.67659408562]
Coordinates of the circumscribed circle: U[14; 7.33989483308]
Coordinates of the inscribed circle: I[13; 7.86331589258]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 124.6721991008° = 124°40'19″ = 0.96656559255 rad
∠ B' = β' = 117.6644004496° = 117°39'50″ = 1.0887968364 rad
∠ C' = γ' = 117.6644004496° = 117°39'50″ = 1.0887968364 rad

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    