# 14 18 28 triangle

### Obtuse scalene triangle.

Sides: a = 14   b = 18   c = 28

Area: T = 107.331126292
Perimeter: p = 60
Semiperimeter: s = 30

Angle ∠ A = α = 25.20987652968° = 25°12'32″ = 0.44399759548 rad
Angle ∠ B = β = 33.2033099198° = 33°12'11″ = 0.58795034029 rad
Angle ∠ C = γ = 121.5888135505° = 121°35'17″ = 2.12221132959 rad

Height: ha = 15.333303756
Height: hb = 11.926569588
Height: hc = 7.667651878

Median: ma = 22.47222050542
Median: mb = 20.22437484162
Median: mc = 8

Inradius: r = 3.5787708764
Circumradius: R = 16.43550996346

Vertex coordinates: A[28; 0] B[0; 0] C[11.71442857143; 7.667651878]
Centroid: CG[13.23880952381; 2.556550626]
Coordinates of the circumscribed circle: U[14; -8.60988617134]
Coordinates of the inscribed circle: I[12; 3.5787708764]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 154.7911234703° = 154°47'28″ = 0.44399759548 rad
∠ B' = β' = 146.7976900802° = 146°47'49″ = 0.58795034029 rad
∠ C' = γ' = 58.41218644948° = 58°24'43″ = 2.12221132959 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.