# 9 23 25 triangle

### Obtuse scalene triangle.

Sides: a = 9   b = 23   c = 25

Area: T = 103.4322042907
Perimeter: p = 57
Semiperimeter: s = 28.5

Angle ∠ A = α = 21.08656802932° = 21°5'8″ = 0.36880145461 rad
Angle ∠ B = β = 66.83879312011° = 66°50'17″ = 1.16765419647 rad
Angle ∠ C = γ = 92.07663885057° = 92°4'35″ = 1.60770361428 rad

Height: ha = 22.98548984239
Height: hb = 8.99440906876
Height: hc = 8.27545634326

Median: ma = 23.5965550428
Median: mb = 14.85876579581
Median: mc = 12.19663109177

Inradius: r = 3.6299194488
Circumradius: R = 12.50882127708

Vertex coordinates: A[25; 0] B[0; 0] C[3.54; 8.27545634326]
Centroid: CG[9.51333333333; 2.75881878109]
Coordinates of the circumscribed circle: U[12.5; -0.45331961149]
Coordinates of the inscribed circle: I[5.5; 3.6299194488]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 158.9144319707° = 158°54'52″ = 0.36880145461 rad
∠ B' = β' = 113.1622068799° = 113°9'43″ = 1.16765419647 rad
∠ C' = γ' = 87.92436114943° = 87°55'25″ = 1.60770361428 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.