# 12 26 29 triangle

### Obtuse scalene triangle.

Sides: a = 12   b = 26   c = 29

Area: T = 155.9121633626
Perimeter: p = 67
Semiperimeter: s = 33.5

Angle ∠ A = α = 24.42985843239° = 24°25'43″ = 0.42663592281 rad
Angle ∠ B = β = 63.64328281632° = 63°38'34″ = 1.11107768967 rad
Angle ∠ C = γ = 91.92985875129° = 91°55'43″ = 1.60444565288 rad

Height: ha = 25.9855272271
Height: hb = 11.99332025866
Height: hc = 10.7532526457

Median: ma = 26.87993601114
Median: mb = 17.98661057486
Median: mc = 14.13332940251

Inradius: r = 4.65440786157
Circumradius: R = 14.50882181964

Vertex coordinates: A[29; 0] B[0; 0] C[5.32875862069; 10.7532526457]
Centroid: CG[11.44325287356; 3.58441754857]
Coordinates of the circumscribed circle: U[14.5; -0.48882573431]
Coordinates of the inscribed circle: I[7.5; 4.65440786157]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 155.5711415676° = 155°34'17″ = 0.42663592281 rad
∠ B' = β' = 116.3577171837° = 116°21'26″ = 1.11107768967 rad
∠ C' = γ' = 88.07114124871° = 88°4'17″ = 1.60444565288 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.