# 12 25 29 triangle

### Obtuse scalene triangle.

Sides: a = 12   b = 25   c = 29

Area: T = 148.9166083752
Perimeter: p = 66
Semiperimeter: s = 33

Angle ∠ A = α = 24.25552873422° = 24°15'19″ = 0.42333346251 rad
Angle ∠ B = β = 58.85326100785° = 58°51'9″ = 1.02771718193 rad
Angle ∠ C = γ = 96.89221025793° = 96°53'32″ = 1.69110862092 rad

Height: ha = 24.8199347292
Height: hb = 11.91332867002
Height: hc = 10.27700747415

Median: ma = 26.40107575649
Median: mb = 18.33771208209
Median: mc = 13.22003787824

Inradius: r = 4.51326085985
Circumradius: R = 14.6065541223

Vertex coordinates: A[29; 0] B[0; 0] C[6.20768965517; 10.27700747415]
Centroid: CG[11.73656321839; 3.42333582472]
Coordinates of the circumscribed circle: U[14.5; -1.75326649468]
Coordinates of the inscribed circle: I[8; 4.51326085985]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 155.7454712658° = 155°44'41″ = 0.42333346251 rad
∠ B' = β' = 121.1477389922° = 121°8'51″ = 1.02771718193 rad
∠ C' = γ' = 83.10878974207° = 83°6'28″ = 1.69110862092 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.