# 7 28 29 triangle

### Obtuse scalene triangle.

Sides: a = 7   b = 28   c = 29

Area: T = 97.98795897113
Perimeter: p = 64
Semiperimeter: s = 32

Angle ∠ A = α = 13.96549945758° = 13°57'54″ = 0.24437351354 rad
Angle ∠ B = β = 74.86656226185° = 74°51'56″ = 1.30766516112 rad
Angle ∠ C = γ = 91.16993828056° = 91°10'10″ = 1.5911205907 rad

Height: ha = 27.9944168489
Height: hb = 6.99985421222
Height: hc = 6.75772130835

Median: ma = 28.28986903196
Median: mb = 15.78797338381
Median: mc = 14.36114066163

Inradius: r = 3.06218621785
Circumradius: R = 14.50330205187

Vertex coordinates: A[29; 0] B[0; 0] C[1.82875862069; 6.75772130835]
Centroid: CG[10.2765862069; 2.25224043612]
Coordinates of the circumscribed circle: U[14.5; -0.29659800106]
Coordinates of the inscribed circle: I[4; 3.06218621785]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 166.0355005424° = 166°2'6″ = 0.24437351354 rad
∠ B' = β' = 105.1344377381° = 105°8'4″ = 1.30766516112 rad
∠ C' = γ' = 88.83106171944° = 88°49'50″ = 1.5911205907 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.