# Triangle calculator

Please enter what you know about the triangle:
You have entered side a, b and c.

### Obtuse isosceles triangle.

Sides: a = 19.5   b = 19.5   c = 32

Area: T = 178.3487974477
Perimeter: p = 71
Semiperimeter: s = 35.5

Angle ∠ A = α = 34.86438379543° = 34°51'50″ = 0.60884887622 rad
Angle ∠ B = β = 34.86438379543° = 34°51'50″ = 0.60884887622 rad
Angle ∠ C = γ = 110.2722324091° = 110°16'20″ = 1.92546151292 rad

Height: ha = 18.29220999463
Height: hb = 18.29220999463
Height: hc = 11.14767484048

Median: ma = 24.63986383552
Median: mb = 24.63986383552
Median: mc = 11.14767484048

Inradius: r = 5.0243886605
Circumradius: R = 17.05765435852

Vertex coordinates: A[32; 0] B[0; 0] C[16; 11.14767484048]
Centroid: CG[16; 3.71655828016]
Coordinates of the circumscribed circle: U[16; -5.91097951804]
Coordinates of the inscribed circle: I[16; 5.0243886605]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 145.1366162046° = 145°8'10″ = 0.60884887622 rad
∠ B' = β' = 145.1366162046° = 145°8'10″ = 0.60884887622 rad
∠ C' = γ' = 69.72876759086° = 69°43'40″ = 1.92546151292 rad

# How did we calculate this triangle?

### 1. Input data entered: side a, b and c. ### 2. The triangle circumference is the sum of the lengths of its three sides ### 3. Semiperimeter of the triangle ### 4. The triangle area using Heron's formula ### 5. Calculate the heights of the triangle from its area. ### 6. Calculation of the inner angles of the triangle using a Law of Cosines ### 7. Inradius ### 8. Circumradius ### 9. Calculation of medians #### Look also our friend's collection of math examples and problems:

See more informations about triangles or more information about solving triangles.