# 22 26 28 triangle

### Acute scalene triangle.

Sides: a = 22   b = 26   c = 28

Area: T = 270.1111088258
Perimeter: p = 76
Semiperimeter: s = 38

Angle ∠ A = α = 47.90774859842° = 47°54'27″ = 0.83661433668 rad
Angle ∠ B = β = 61.28106643991° = 61°16'50″ = 1.07695493616 rad
Angle ∠ C = γ = 70.81218496167° = 70°48'43″ = 1.23658999252 rad

Height: ha = 24.5565553478
Height: hb = 20.77877760199
Height: hc = 19.29436491613

Median: ma = 24.67879253585
Median: mb = 21.56438586528
Median: mc = 19.59659179423

Inradius: r = 7.10881865331
Circumradius: R = 14.82435306659

Vertex coordinates: A[28; 0] B[0; 0] C[10.57114285714; 19.29436491613]
Centroid: CG[12.85771428571; 6.43112163871]
Coordinates of the circumscribed circle: U[14; 4.87220695196]
Coordinates of the inscribed circle: I[12; 7.10881865331]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 132.0932514016° = 132°5'33″ = 0.83661433668 rad
∠ B' = β' = 118.7199335601° = 118°43'10″ = 1.07695493616 rad
∠ C' = γ' = 109.1888150383° = 109°11'17″ = 1.23658999252 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.