# 11 26 30 triangle

### Obtuse scalene triangle.

Sides: a = 11   b = 26   c = 30

Area: T = 140.6622495001
Perimeter: p = 67
Semiperimeter: s = 33.5

Angle ∠ A = α = 21.14215369426° = 21°8'30″ = 0.36989894286 rad
Angle ∠ B = β = 58.48546299979° = 58°29'5″ = 1.02107493553 rad
Angle ∠ C = γ = 100.3743833059° = 100°22'26″ = 1.75218538697 rad

Height: ha = 25.57549990912
Height: hb = 10.82201919232
Height: hc = 9.37774996668

Median: ma = 27.5277259217
Median: mb = 18.48797186126
Median: mc = 13.17219398723

Inradius: r = 4.19988804478
Circumradius: R = 15.24992674041

Vertex coordinates: A[30; 0] B[0; 0] C[5.75; 9.37774996668]
Centroid: CG[11.91766666667; 3.12658332223]
Coordinates of the circumscribed circle: U[15; -2.74659345151]
Coordinates of the inscribed circle: I[7.5; 4.19988804478]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 158.8588463057° = 158°51'30″ = 0.36989894286 rad
∠ B' = β' = 121.5155370002° = 121°30'55″ = 1.02107493553 rad
∠ C' = γ' = 79.62661669405° = 79°37'34″ = 1.75218538697 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.