# Triangle calculator SSS - result

Please enter the triangle sides:

### Acute isosceles triangle.

Sides: a = 100   b = 100   c = 141.42

Area: T = 50009.99999908
Perimeter: p = 341.42
Semiperimeter: s = 170.71

Angle ∠ A = α = 45.00105494665° = 45°2″ = 0.78554077534 rad
Angle ∠ B = β = 45.00105494665° = 45°2″ = 0.78554077534 rad
Angle ∠ C = γ = 89.99989010669° = 89°59'56″ = 1.57107771468 rad

Height: ha = 100.9999999816
Height: hb = 100.9999999816
Height: hc = 70.71113562308

Median: ma = 111.8032541116
Median: mb = 111.8032541116
Median: mc = 70.71113562308

Inradius: r = 29.28994382232
Circumradius: R = 70.7110000013

Vertex coordinates: A[141.42; 0] B[0; 0] C[70.71; 70.71113562308]
Centroid: CG[70.71; 23.57704520769]
Coordinates of the circumscribed circle: U[70.71; 0.00113562178]
Coordinates of the inscribed circle: I[70.71; 29.28994382232]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 134.9999450533° = 134°59'58″ = 0.78554077534 rad
∠ B' = β' = 134.9999450533° = 134°59'58″ = 0.78554077534 rad
∠ C' = γ' = 90.00110989331° = 90°4″ = 1.57107771468 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    