# 9 26 30 triangle

### Obtuse scalene triangle.

Sides: a = 9   b = 26   c = 30

Area: T = 111.4044387257
Perimeter: p = 65
Semiperimeter: s = 32.5

Angle ∠ A = α = 16.59878421359° = 16°35'52″ = 0.2989686994 rad
Angle ∠ B = β = 55.61105672911° = 55°36'38″ = 0.97105874981 rad
Angle ∠ C = γ = 107.7921590573° = 107°47'30″ = 1.88113181615 rad

Height: ha = 24.75765305014
Height: hb = 8.57695682505
Height: hc = 7.42769591504

Median: ma = 27.7088302005
Median: mb = 17.9330421077
Median: mc = 12.39895116934

Inradius: r = 3.42878273002
Circumradius: R = 15.75334190818

Vertex coordinates: A[30; 0] B[0; 0] C[5.08333333333; 7.42769591504]
Centroid: CG[11.69444444444; 2.47656530501]
Coordinates of the circumscribed circle: U[15; -4.81435447194]
Coordinates of the inscribed circle: I[6.5; 3.42878273002]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 163.4022157864° = 163°24'8″ = 0.2989686994 rad
∠ B' = β' = 124.3899432709° = 124°23'22″ = 0.97105874981 rad
∠ C' = γ' = 72.2088409427° = 72°12'30″ = 1.88113181615 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.