# 16 20 28 triangle

### Obtuse scalene triangle.

Sides: a = 16   b = 20   c = 28

Area: T = 156.7677343538
Perimeter: p = 64
Semiperimeter: s = 32

Angle ∠ A = α = 34.048773237° = 34°2'52″ = 0.59442450327 rad
Angle ∠ B = β = 44.41553085972° = 44°24'55″ = 0.77551933733 rad
Angle ∠ C = γ = 101.5376959033° = 101°32'13″ = 1.77221542476 rad

Height: ha = 19.59659179423
Height: hb = 15.67767343538
Height: hc = 11.19876673956

Median: ma = 22.97882505862
Median: mb = 20.49439015319
Median: mc = 11.48991252931

Inradius: r = 4.89989794856
Circumradius: R = 14.28986901662

Vertex coordinates: A[28; 0] B[0; 0] C[11.42985714286; 11.19876673956]
Centroid: CG[13.14328571429; 3.73325557985]
Coordinates of the circumscribed circle: U[14; -2.85877380332]
Coordinates of the inscribed circle: I[12; 4.89989794856]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 145.952226763° = 145°57'8″ = 0.59442450327 rad
∠ B' = β' = 135.5854691403° = 135°35'5″ = 0.77551933733 rad
∠ C' = γ' = 78.46330409672° = 78°27'47″ = 1.77221542476 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.