# 4 25 25 triangle

### Acute isosceles triangle.

Sides: a = 4   b = 25   c = 25

Area: T = 49.84397431775
Perimeter: p = 54
Semiperimeter: s = 27

Angle ∠ A = α = 9.17771314716° = 9°10'38″ = 0.16601711601 rad
Angle ∠ B = β = 85.41114342642° = 85°24'41″ = 1.49107107468 rad
Angle ∠ C = γ = 85.41114342642° = 85°24'41″ = 1.49107107468 rad

Height: ha = 24.92198715888
Height: hb = 3.98771794542
Height: hc = 3.98771794542

Median: ma = 24.92198715888
Median: mb = 12.8166005618
Median: mc = 12.8166005618

Inradius: r = 1.8465916414
Circumradius: R = 12.54401930298

Vertex coordinates: A[25; 0] B[0; 0] C[0.32; 3.98771794542]
Centroid: CG[8.44; 1.32990598181]
Coordinates of the circumscribed circle: U[12.5; 1.00332154424]
Coordinates of the inscribed circle: I[2; 1.8465916414]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 170.8232868528° = 170°49'22″ = 0.16601711601 rad
∠ B' = β' = 94.58985657358° = 94°35'19″ = 1.49107107468 rad
∠ C' = γ' = 94.58985657358° = 94°35'19″ = 1.49107107468 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.