# Triangle calculator SSS - result

Please enter the triangle sides:

### Acute isosceles triangle.

Sides: a = 12   b = 13   c = 13

Area: T = 69.1955375568
Perimeter: p = 38
Semiperimeter: s = 19

Angle ∠ A = α = 54.97328525008° = 54°58'22″ = 0.95994572754 rad
Angle ∠ B = β = 62.51435737496° = 62°30'49″ = 1.09110676891 rad
Angle ∠ C = γ = 62.51435737496° = 62°30'49″ = 1.09110676891 rad

Height: ha = 11.53325625947
Height: hb = 10.64554423951
Height: hc = 10.64554423951

Median: ma = 11.53325625947
Median: mb = 10.68987791632
Median: mc = 10.68987791632

Inradius: r = 3.6421861872
Circumradius: R = 7.32770792425

Vertex coordinates: A[13; 0] B[0; 0] C[5.53884615385; 10.64554423951]
Centroid: CG[6.17994871795; 3.54884807984]
Coordinates of the circumscribed circle: U[6.5; 3.38217288811]
Coordinates of the inscribed circle: I[6; 3.6421861872]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 125.0277147499° = 125°1'38″ = 0.95994572754 rad
∠ B' = β' = 117.486642625° = 117°29'11″ = 1.09110676891 rad
∠ C' = γ' = 117.486642625° = 117°29'11″ = 1.09110676891 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.