# 3 28 29 triangle

### Obtuse scalene triangle.

Sides: a = 3   b = 28   c = 29

Area: T = 40.2499223595
Perimeter: p = 60
Semiperimeter: s = 30

Angle ∠ A = α = 5.68994207757° = 5°41'22″ = 0.09992991251 rad
Angle ∠ B = β = 67.70990296252° = 67°42'33″ = 1.18217455003 rad
Angle ∠ C = γ = 106.6021549599° = 106°36'6″ = 1.86105480282 rad

Height: ha = 26.833281573
Height: hb = 2.87549445425
Height: hc = 2.77658085238

Median: ma = 28.4654890655
Median: mb = 15.13327459504
Median: mc = 13.6477344064

Inradius: r = 1.34216407865
Circumradius: R = 15.13107266477

Vertex coordinates: A[29; 0] B[0; 0] C[1.13879310345; 2.77658085238]
Centroid: CG[10.04659770115; 0.92552695079]
Coordinates of the circumscribed circle: U[14.5; -4.32330647565]
Coordinates of the inscribed circle: I[2; 1.34216407865]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 174.3110579224° = 174°18'38″ = 0.09992991251 rad
∠ B' = β' = 112.2910970375° = 112°17'27″ = 1.18217455003 rad
∠ C' = γ' = 73.3988450401° = 73°23'54″ = 1.86105480282 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.