# 22 22 25 triangle

### Acute isosceles triangle.

Sides: a = 22   b = 22   c = 25

Area: T = 226.2988337378
Perimeter: p = 69
Semiperimeter: s = 34.5

Angle ∠ A = α = 55.37664645208° = 55°22'35″ = 0.9676501634 rad
Angle ∠ B = β = 55.37664645208° = 55°22'35″ = 0.9676501634 rad
Angle ∠ C = γ = 69.24770709584° = 69°14'49″ = 1.20985893856 rad

Height: ha = 20.57325761253
Height: hb = 20.57325761253
Height: hc = 18.10438669902

Median: ma = 20.82106628137
Median: mb = 20.82106628137
Median: mc = 18.10438669902

Inradius: r = 6.55993720979
Circumradius: R = 13.36773098753

Vertex coordinates: A[25; 0] B[0; 0] C[12.5; 18.10438669902]
Centroid: CG[12.5; 6.03546223301]
Coordinates of the circumscribed circle: U[12.5; 4.73765571149]
Coordinates of the inscribed circle: I[12.5; 6.55993720979]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 124.6243535479° = 124°37'25″ = 0.9676501634 rad
∠ B' = β' = 124.6243535479° = 124°37'25″ = 0.9676501634 rad
∠ C' = γ' = 110.7532929042° = 110°45'11″ = 1.20985893856 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.