# 11 25 30 triangle

### Obtuse scalene triangle.

Sides: a = 11   b = 25   c = 30

Area: T = 132
Perimeter: p = 66
Semiperimeter: s = 33

Angle ∠ A = α = 20.61096929375° = 20°36'35″ = 0.36597069996 rad
Angle ∠ B = β = 53.13301023542° = 53°7'48″ = 0.9277295218 rad
Angle ∠ C = γ = 106.2660204708° = 106°15'37″ = 1.8554590436 rad

Height: ha = 24
Height: hb = 10.56
Height: hc = 8.8

Median: ma = 27.06601182555
Median: mb = 18.82215302247
Median: mc = 12.16655250606

Inradius: r = 4
Circumradius: R = 15.625

Vertex coordinates: A[30; 0] B[0; 0] C[6.6; 8.8]
Centroid: CG[12.2; 2.93333333333]
Coordinates of the circumscribed circle: U[15; -4.375]
Coordinates of the inscribed circle: I[8; 4]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 159.3990307062° = 159°23'25″ = 0.36597069996 rad
∠ B' = β' = 126.8769897646° = 126°52'12″ = 0.9277295218 rad
∠ C' = γ' = 73.74397952917° = 73°44'23″ = 1.8554590436 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.