# 3.8 4.1 5.2 triangle

### Acute scalene triangle.

Sides: a = 3.8   b = 4.1   c = 5.2

Area: T = 7.71985713542
Perimeter: p = 13.1
Semiperimeter: s = 6.55

Angle ∠ A = α = 46.3911421996° = 46°23'29″ = 0.81096830585 rad
Angle ∠ B = β = 51.3743507486° = 51°22'25″ = 0.89766368539 rad
Angle ∠ C = γ = 82.2355070518° = 82°14'6″ = 1.43552727411 rad

Height: ha = 4.06224059759
Height: hb = 3.76551567582
Height: hc = 2.96986812901

Median: ma = 4.28796027853
Median: mb = 4.06766325135
Median: mc = 2.97774149862

Inradius: r = 1.17884078403
Circumradius: R = 2.62440607323

Vertex coordinates: A[5.2; 0] B[0; 0] C[2.37221153846; 2.96986812901]
Centroid: CG[2.52440384615; 0.998956043]
Coordinates of the circumscribed circle: U[2.6; 0.35545345213]
Coordinates of the inscribed circle: I[2.45; 1.17884078403]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 133.6098578004° = 133°36'31″ = 0.81096830585 rad
∠ B' = β' = 128.6266492514° = 128°37'35″ = 0.89766368539 rad
∠ C' = γ' = 97.7654929482° = 97°45'54″ = 1.43552727411 rad

# How did we calculate this triangle?

### 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.