# 8 19 25 triangle

### Obtuse scalene triangle.

Sides: a = 8   b = 19   c = 25

Area: T = 57.2366352085
Perimeter: p = 52
Semiperimeter: s = 26

Angle ∠ A = α = 13.94552833377° = 13°56'43″ = 0.24333911094 rad
Angle ∠ B = β = 34.91552062474° = 34°54'55″ = 0.6099385308 rad
Angle ∠ C = γ = 131.1439510415° = 131°8'22″ = 2.28988162362 rad

Height: ha = 14.30990880213
Height: hb = 6.02548791668
Height: hc = 4.57989081668

Median: ma = 21.84403296678
Median: mb = 15.94552187191
Median: mc = 7.5

Inradius: r = 2.20113981571
Circumradius: R = 16.59878432481

Vertex coordinates: A[25; 0] B[0; 0] C[6.56; 4.57989081668]
Centroid: CG[10.52; 1.52663027223]
Coordinates of the circumscribed circle: U[12.5; -10.92196337159]
Coordinates of the inscribed circle: I[7; 2.20113981571]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 166.0554716662° = 166°3'17″ = 0.24333911094 rad
∠ B' = β' = 145.0854793753° = 145°5'5″ = 0.6099385308 rad
∠ C' = γ' = 48.86604895851° = 48°51'38″ = 2.28988162362 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.