# 7 25 25 triangle

### Acute isosceles triangle.

Sides: a = 7   b = 25   c = 25

Area: T = 86.63882565614
Perimeter: p = 57
Semiperimeter: s = 28.5

Angle ∠ A = α = 16.09656924946° = 16°5'44″ = 0.28109228294 rad
Angle ∠ B = β = 81.95221537527° = 81°57'8″ = 1.43303349121 rad
Angle ∠ C = γ = 81.95221537527° = 81°57'8″ = 1.43303349121 rad

Height: ha = 24.7543787589
Height: hb = 6.93110605249
Height: hc = 6.93110605249

Median: ma = 24.7543787589
Median: mb = 13.44443296597
Median: mc = 13.44443296597

Inradius: r = 3.04399388267
Circumradius: R = 12.62443306757

Vertex coordinates: A[25; 0] B[0; 0] C[0.98; 6.93110605249]
Centroid: CG[8.66; 2.31103535083]
Coordinates of the circumscribed circle: U[12.5; 1.76774062946]
Coordinates of the inscribed circle: I[3.5; 3.04399388267]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 163.9044307505° = 163°54'16″ = 0.28109228294 rad
∠ B' = β' = 98.04878462473° = 98°2'52″ = 1.43303349121 rad
∠ C' = γ' = 98.04878462473° = 98°2'52″ = 1.43303349121 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.