# 14 14 20 triangle

### Obtuse isosceles triangle.

Sides: a = 14   b = 14   c = 20

Area: T = 97.98795897113
Perimeter: p = 48
Semiperimeter: s = 24

Angle ∠ A = α = 44.41553085972° = 44°24'55″ = 0.77551933733 rad
Angle ∠ B = β = 44.41553085972° = 44°24'55″ = 0.77551933733 rad
Angle ∠ C = γ = 91.16993828056° = 91°10'10″ = 1.5911205907 rad

Height: ha = 13.99770842445
Height: hb = 13.99770842445
Height: hc = 9.79879589711

Median: ma = 15.78797338381
Median: mb = 15.78797338381
Median: mc = 9.79879589711

Inradius: r = 4.08224829046
Circumradius: R = 10.00220831164

Vertex coordinates: A[20; 0] B[0; 0] C[10; 9.79879589711]
Centroid: CG[10; 3.26659863237]
Coordinates of the circumscribed circle: U[10; -0.20441241452]
Coordinates of the inscribed circle: I[10; 4.08224829046]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 135.5854691403° = 135°35'5″ = 0.77551933733 rad
∠ B' = β' = 135.5854691403° = 135°35'5″ = 0.77551933733 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.