# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse isosceles triangle.

Sides: a = 75   b = 75   c = 106.07

Area: T = 2812.549999207
Perimeter: p = 256.07
Semiperimeter: s = 128.035

Angle ∠ A = α = 44.99878484798° = 44°59'52″ = 0.78553606123 rad
Angle ∠ B = β = 44.99878484798° = 44°59'52″ = 0.78553606123 rad
Angle ∠ C = γ = 90.00443030404° = 90°15″ = 1.5710871429 rad

Height: ha = 754.9999997885
Height: hb = 754.9999997885
Height: hc = 53.03110171032

Median: ma = 83.85550681235
Median: mb = 83.85550681235
Median: mc = 53.03110171032

Inradius: r = 21.96766496823
Circumradius: R = 53.03550001496

Vertex coordinates: A[106.07; 0] B[0; 0] C[53.035; 53.03110171032]
Centroid: CG[53.035; 17.67770057011]
Coordinates of the circumscribed circle: U[53.035; -0.00439830464]
Coordinates of the inscribed circle: I[53.035; 21.96766496823]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 135.002215152° = 135°8″ = 0.78553606123 rad
∠ B' = β' = 135.002215152° = 135°8″ = 0.78553606123 rad
∠ C' = γ' = 89.99656969596° = 89°59'45″ = 1.5710871429 rad

# How did we calculate this triangle?

### 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    