# 7 22 28 triangle

### Obtuse scalene triangle.

Sides: a = 7   b = 22   c = 28

Area: T = 44.6265525207
Perimeter: p = 57
Semiperimeter: s = 28.5

Angle ∠ A = α = 8.33107975597° = 8°19'51″ = 0.14553998467 rad
Angle ∠ B = β = 27.08882606768° = 27°5'18″ = 0.47327793374 rad
Angle ∠ C = γ = 144.5810941764° = 144°34'51″ = 2.52334134694 rad

Height: ha = 12.75501500591
Height: hb = 4.05768659279
Height: hc = 3.18875375148

Median: ma = 24.93549152796
Median: mb = 17.19901134377
Median: mc = 8.39664278119

Inradius: r = 1.5665807902
Circumradius: R = 24.1576578438

Vertex coordinates: A[28; 0] B[0; 0] C[6.23221428571; 3.18875375148]
Centroid: CG[11.41107142857; 1.06325125049]
Coordinates of the circumscribed circle: U[14; -19.6866042818]
Coordinates of the inscribed circle: I[6.5; 1.5665807902]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 171.669920244° = 171°40'9″ = 0.14553998467 rad
∠ B' = β' = 152.9121739323° = 152°54'42″ = 0.47327793374 rad
∠ C' = γ' = 35.41990582365° = 35°25'9″ = 2.52334134694 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.