# 9 11 19 triangle

### Obtuse scalene triangle.

Sides: a = 9   b = 11   c = 19

Area: T = 29.49989406589
Perimeter: p = 39
Semiperimeter: s = 19.5

Angle ∠ A = α = 16.39767184924° = 16°23'48″ = 0.28661767242 rad
Angle ∠ B = β = 20.18328243451° = 20°10'58″ = 0.35222567372 rad
Angle ∠ C = γ = 143.4220457162° = 143°25'14″ = 2.50331591922 rad

Height: ha = 6.55553201464
Height: hb = 5.36334437562
Height: hc = 3.10551516483

Median: ma = 14.85876579581
Median: mb = 13.81112273169
Median: mc = 3.27987192622

Inradius: r = 1.51327661876
Circumradius: R = 15.94112504143

Vertex coordinates: A[19; 0] B[0; 0] C[8.44773684211; 3.10551516483]
Centroid: CG[9.1499122807; 1.03550505494]
Coordinates of the circumscribed circle: U[9.5; -12.80113071509]
Coordinates of the inscribed circle: I[8.5; 1.51327661876]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 163.6033281508° = 163°36'12″ = 0.28661767242 rad
∠ B' = β' = 159.8177175655° = 159°49'2″ = 0.35222567372 rad
∠ C' = γ' = 36.58795428375° = 36°34'46″ = 2.50331591922 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.