# 7 25 28 triangle

### Obtuse scalene triangle.

Sides: a = 7   b = 25   c = 28

Area: T = 83.06662386292
Perimeter: p = 60
Semiperimeter: s = 30

Angle ∠ A = α = 13.72991326754° = 13°43'45″ = 0.24396185686 rad
Angle ∠ B = β = 57.95331689134° = 57°57'11″ = 1.01114736095 rad
Angle ∠ C = γ = 108.3187698411° = 108°19'4″ = 1.89105004755 rad

Height: ha = 23.73332110369
Height: hb = 6.64552990903
Height: hc = 5.93333027592

Median: ma = 26.31106442338
Median: mb = 16.13222658049
Median: mc = 11.8744342087

Inradius: r = 2.7698874621
Circumradius: R = 14.7477267003

Vertex coordinates: A[28; 0] B[0; 0] C[3.71442857143; 5.93333027592]
Centroid: CG[10.57114285714; 1.97877675864]
Coordinates of the circumscribed circle: U[14; -4.63548553438]
Coordinates of the inscribed circle: I[5; 2.7698874621]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 166.2710867325° = 166°16'15″ = 0.24396185686 rad
∠ B' = β' = 122.0476831087° = 122°2'49″ = 1.01114736095 rad
∠ C' = γ' = 71.68223015888° = 71°40'56″ = 1.89105004755 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.