Isosceles triangle calculator (A,c)
Acute isosceles triangle.
Sides: a = 70.00875722087 b = 70.00875722087 c = 90Area: T = 2413.3011025
Perimeter: p = 230.0155144417
Semiperimeter: s = 115.0087572209
Angle ∠ A = α = 50° = 0.8732664626 rad
Angle ∠ B = β = 50° = 0.8732664626 rad
Angle ∠ C = γ = 80° = 1.39662634016 rad
Height: ha = 68.94439998807
Height: hb = 68.94439998807
Height: hc = 53.62989116667
Median: ma = 72.63110198306
Median: mb = 72.63110198306
Median: mc = 53.62989116667
Inradius: r = 20.9843844617
Circumradius: R = 45.69441975349
Vertex coordinates: A[90; 0] B[0; 0] C[45; 53.62989116667]
Centroid: CG[45; 17.87663038889]
Coordinates of the circumscribed circle: U[45; 7.93547141319]
Coordinates of the inscribed circle: I[45; 20.9843844617]
Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 130° = 0.8732664626 rad
∠ B' = β' = 130° = 0.8732664626 rad
∠ C' = γ' = 100° = 1.39662634016 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
