# 3 6 8 triangle

### Obtuse scalene triangle.

Sides: a = 3   b = 6   c = 8

Area: T = 7.64444424257
Perimeter: p = 17
Semiperimeter: s = 8.5

Angle ∠ A = α = 18.57333497187° = 18°34'24″ = 0.32441661057 rad
Angle ∠ B = β = 39.57112194572° = 39°34'16″ = 0.69106480686 rad
Angle ∠ C = γ = 121.8555430824° = 121°51'20″ = 2.12767784793 rad

Height: ha = 5.09662949505
Height: hb = 2.54881474752
Height: hc = 1.91111106064

Median: ma = 6.91101374805
Median: mb = 5.24440442409
Median: mc = 2.55495097568

Inradius: r = 0.89993461677
Circumradius: R = 4.70993035692

Vertex coordinates: A[8; 0] B[0; 0] C[2.31325; 1.91111106064]
Centroid: CG[3.43875; 0.63770368688]
Coordinates of the circumscribed circle: U[4; -2.48554657726]
Coordinates of the inscribed circle: I[2.5; 0.89993461677]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 161.4276650281° = 161°25'36″ = 0.32441661057 rad
∠ B' = β' = 140.4298780543° = 140°25'44″ = 0.69106480686 rad
∠ C' = γ' = 58.1454569176° = 58°8'40″ = 2.12767784793 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.