# 11 20 29 triangle

### Obtuse scalene triangle.

Sides: a = 11   b = 20   c = 29

Area: T = 75.49883443527
Perimeter: p = 60
Semiperimeter: s = 30

Angle ∠ A = α = 15.09901851794° = 15°5'25″ = 0.26333734161 rad
Angle ∠ B = β = 28.25215730478° = 28°15'6″ = 0.49330829686 rad
Angle ∠ C = γ = 136.6588241773° = 136°39'30″ = 2.38551362689 rad

Height: ha = 13.72769717005
Height: hb = 7.55498344353
Height: hc = 5.20767823692

Median: ma = 24.29550612265
Median: mb = 19.51992212959
Median: mc = 7.08987234394

Inradius: r = 2.51766114784
Circumradius: R = 21.12662910952

Vertex coordinates: A[29; 0] B[0; 0] C[9.69896551724; 5.20767823692]
Centroid: CG[12.89765517241; 1.73655941231]
Coordinates of the circumscribed circle: U[14.5; -15.3654575342]
Coordinates of the inscribed circle: I[10; 2.51766114784]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 164.9109814821° = 164°54'35″ = 0.26333734161 rad
∠ B' = β' = 151.7488426952° = 151°44'54″ = 0.49330829686 rad
∠ C' = γ' = 43.34217582272° = 43°20'30″ = 2.38551362689 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.