# 19 19 29 triangle

### Obtuse isosceles triangle.

Sides: a = 19   b = 19   c = 29

Area: T = 178.0311422788
Perimeter: p = 67
Semiperimeter: s = 33.5

Angle ∠ A = α = 40.25766125764° = 40°15'24″ = 0.70326104352 rad
Angle ∠ B = β = 40.25766125764° = 40°15'24″ = 0.70326104352 rad
Angle ∠ C = γ = 99.48767748473° = 99°29'12″ = 1.73663717833 rad

Height: ha = 18.74401497672
Height: hb = 18.74401497672
Height: hc = 12.27880291578

Median: ma = 22.659977876
Median: mb = 22.659977876
Median: mc = 12.27880291578

Inradius: r = 5.31443708295
Circumradius: R = 14.70110564709

Vertex coordinates: A[29; 0] B[0; 0] C[14.5; 12.27880291578]
Centroid: CG[14.5; 4.09326763859]
Coordinates of the circumscribed circle: U[14.5; -2.42330273131]
Coordinates of the inscribed circle: I[14.5; 5.31443708295]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 139.7433387424° = 139°44'36″ = 0.70326104352 rad
∠ B' = β' = 139.7433387424° = 139°44'36″ = 0.70326104352 rad
∠ C' = γ' = 80.51332251527° = 80°30'48″ = 1.73663717833 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.