# 3 25 25 triangle

### Acute isosceles triangle.

Sides: a = 3   b = 25   c = 25

Area: T = 37.43224391404
Perimeter: p = 53
Semiperimeter: s = 26.5

Angle ∠ A = α = 6.8879625535° = 6°52'47″ = 0.12200721169 rad
Angle ∠ B = β = 86.56601872325° = 86°33'37″ = 1.51107602683 rad
Angle ∠ C = γ = 86.56601872325° = 86°33'37″ = 1.51107602683 rad

Height: ha = 24.95549594269
Height: hb = 2.99545951312
Height: hc = 2.99545951312

Median: ma = 24.95549594269
Median: mb = 12.67987223331
Median: mc = 12.67987223331

Inradius: r = 1.41325448732
Circumradius: R = 12.52325609328

Vertex coordinates: A[25; 0] B[0; 0] C[0.18; 2.99545951312]
Centroid: CG[8.39333333333; 0.99881983771]
Coordinates of the circumscribed circle: U[12.5; 0.7511353656]
Coordinates of the inscribed circle: I[1.5; 1.41325448732]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 173.1220374465° = 173°7'13″ = 0.12200721169 rad
∠ B' = β' = 93.44398127675° = 93°26'23″ = 1.51107602683 rad
∠ C' = γ' = 93.44398127675° = 93°26'23″ = 1.51107602683 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.