# 13 14 14 triangle

### Acute isosceles triangle.

Sides: a = 13   b = 14   c = 14

Area: T = 80.59773789896
Perimeter: p = 41
Semiperimeter: s = 20.5

Angle ∠ A = α = 55.32880089924° = 55°19'41″ = 0.96656559255 rad
Angle ∠ B = β = 62.33659955038° = 62°20'10″ = 1.0887968364 rad
Angle ∠ C = γ = 62.33659955038° = 62°20'10″ = 1.0887968364 rad

Height: ha = 12.43995967676
Height: hb = 11.51439112842
Height: hc = 11.51439112842

Median: ma = 12.43995967676
Median: mb = 11.55442200083
Median: mc = 11.55442200083

Inradius: r = 3.93215794629
Circumradius: R = 7.90334828177

Vertex coordinates: A[14; 0] B[0; 0] C[6.03657142857; 11.51439112842]
Centroid: CG[6.67985714286; 3.83879704281]
Coordinates of the circumscribed circle: U[7; 3.66994741654]
Coordinates of the inscribed circle: I[6.5; 3.93215794629]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 124.6721991008° = 124°40'19″ = 0.96656559255 rad
∠ B' = β' = 117.6644004496° = 117°39'50″ = 1.0887968364 rad
∠ C' = γ' = 117.6644004496° = 117°39'50″ = 1.0887968364 rad

# How did we calculate this triangle?

Now we know the lengths of all three sides of the triangle and the triangle is uniquely determined. Next we calculate another its characteristics - same procedure as calculation of the triangle from the known three sides SSS. ### 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.