6 16 18 triangle
Obtuse scalene triangle.
Sides: a = 6 b = 16 c = 18Area: T = 47.32986382648
Perimeter: p = 40
Semiperimeter: s = 20
Angle ∠ A = α = 19.18881364537° = 19°11'17″ = 0.33548961584 rad
Angle ∠ B = β = 61.21877953194° = 61°13'4″ = 1.06884520891 rad
Angle ∠ C = γ = 99.59440682269° = 99°35'39″ = 1.7388244406 rad
Height: ha = 15.77662127549
Height: hb = 5.91660797831
Height: hc = 5.2598737585
Median: ma = 16.76330546142
Median: mb = 10.77703296143
Median: mc = 8.06222577483
Inradius: r = 2.36664319132
Circumradius: R = 9.12876659511
Vertex coordinates: A[18; 0] B[0; 0] C[2.88988888889; 5.2598737585]
Centroid: CG[6.9632962963; 1.75329125283]
Coordinates of the circumscribed circle: U[9; -1.52112776585]
Coordinates of the inscribed circle: I[4; 2.36664319132]
Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 160.8121863546° = 160°48'43″ = 0.33548961584 rad
∠ B' = β' = 118.7822204681° = 118°46'56″ = 1.06884520891 rad
∠ C' = γ' = 80.40659317731° = 80°24'21″ = 1.7388244406 rad
Calculate another triangle
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
