# 25 25 29 triangle

### Acute isosceles triangle.

Sides: a = 25   b = 25   c = 29

Area: T = 295.2988471889
Perimeter: p = 79
Semiperimeter: s = 39.5

Angle ∠ A = α = 54.54994573608° = 54°32'58″ = 0.95220676361 rad
Angle ∠ B = β = 54.54994573608° = 54°32'58″ = 0.95220676361 rad
Angle ∠ C = γ = 70.90110852784° = 70°54'4″ = 1.23774573813 rad

Height: ha = 23.62438777511
Height: hb = 23.62438777511
Height: hc = 20.36554118544

Median: ma = 24.0165619917
Median: mb = 24.0165619917
Median: mc = 20.36554118544

Inradius: r = 7.47659106807
Circumradius: R = 15.34546442544

Vertex coordinates: A[29; 0] B[0; 0] C[14.5; 20.36554118544]
Centroid: CG[14.5; 6.78884706181]
Coordinates of the circumscribed circle: U[14.5; 5.02107676]
Coordinates of the inscribed circle: I[14.5; 7.47659106807]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 125.4510542639° = 125°27'2″ = 0.95220676361 rad
∠ B' = β' = 125.4510542639° = 125°27'2″ = 0.95220676361 rad
∠ C' = γ' = 109.0998914722° = 109°5'56″ = 1.23774573813 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.