# Triangle calculator SSS - result

Please enter the triangle sides:

### Equilateral triangle.

Sides: a = 15   b = 15   c = 15

Area: T = 97.42878579257
Perimeter: p = 45
Semiperimeter: s = 22.5

Angle ∠ A = α = 60° = 1.04771975512 rad
Angle ∠ B = β = 60° = 1.04771975512 rad
Angle ∠ C = γ = 60° = 1.04771975512 rad

Height: ha = 12.99903810568
Height: hb = 12.99903810568
Height: hc = 12.99903810568

Median: ma = 12.99903810568
Median: mb = 12.99903810568
Median: mc = 12.99903810568

Inradius: r = 4.33301270189
Circumradius: R = 8.66602540378

Vertex coordinates: A[15; 0] B[0; 0] C[7.5; 12.99903810568]
Centroid: CG[7.5; 4.33301270189]
Coordinates of the circumscribed circle: U[7.5; 4.33301270189]
Coordinates of the inscribed circle: I[7.5; 4.33301270189]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 120° = 1.04771975512 rad
∠ B' = β' = 120° = 1.04771975512 rad
∠ C' = γ' = 120° = 1.04771975512 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 ### 6. Inradius ### 7. Circumradius ### 8. 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.