# 11 19 25 triangle

### Obtuse scalene triangle.

Sides: a = 11   b = 19   c = 25

Area: T = 98.19546408925
Perimeter: p = 55
Semiperimeter: s = 27.5

Angle ∠ A = α = 24.42218139126° = 24°25'19″ = 0.42662410621 rad
Angle ∠ B = β = 45.57329959992° = 45°34'23″ = 0.79553988302 rad
Angle ∠ C = γ = 110.0055190088° = 110°19″ = 1.92199527613 rad

Height: ha = 17.85435710714
Height: hb = 10.33662779887
Height: hc = 7.85655712714

Median: ma = 21.51216247643
Median: mb = 16.81551717208
Median: mc = 9.20659763198

Inradius: r = 3.57107142143
Circumradius: R = 13.30326607983

Vertex coordinates: A[25; 0] B[0; 0] C[7.7; 7.85655712714]
Centroid: CG[10.9; 2.61985237571]
Coordinates of the circumscribed circle: U[12.5; -4.55109102731]
Coordinates of the inscribed circle: I[8.5; 3.57107142143]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 155.5788186087° = 155°34'41″ = 0.42662410621 rad
∠ B' = β' = 134.4277004001° = 134°25'37″ = 0.79553988302 rad
∠ C' = γ' = 69.99548099118° = 69°59'41″ = 1.92199527613 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.