# 8 20 26 triangle

### Obtuse scalene triangle.

Sides: a = 8   b = 20   c = 26

Area: T = 59.92549530663
Perimeter: p = 54
Semiperimeter: s = 27

Angle ∠ A = α = 13.3255367656° = 13°19'31″ = 0.23325715396 rad
Angle ∠ B = β = 35.18438154883° = 35°11'2″ = 0.61440734237 rad
Angle ∠ C = γ = 131.4910816856° = 131°29'27″ = 2.29549476903 rad

Height: ha = 14.98112382666
Height: hb = 5.99224953066
Height: hc = 4.61096117743

Median: ma = 22.84773193176
Median: mb = 16.43216767252
Median: mc = 7.93772539332

Inradius: r = 2.21994427062
Circumradius: R = 17.35550407098

Vertex coordinates: A[26; 0] B[0; 0] C[6.53884615385; 4.61096117743]
Centroid: CG[10.84661538462; 1.53765372581]
Coordinates of the circumscribed circle: U[13; -11.49877144703]
Coordinates of the inscribed circle: I[7; 2.21994427062]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 166.6754632344° = 166°40'29″ = 0.23325715396 rad
∠ B' = β' = 144.8166184512° = 144°48'58″ = 0.61440734237 rad
∠ C' = γ' = 48.50991831443° = 48°30'33″ = 2.29549476903 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.