# 11 16 25 triangle

### Obtuse scalene triangle.

Sides: a = 11   b = 16   c = 25

Area: T = 62.4549979984
Perimeter: p = 52
Semiperimeter: s = 26

Angle ∠ A = α = 18.19548723388° = 18°11'42″ = 0.31875604293 rad
Angle ∠ B = β = 27.01222939589° = 27°44″ = 0.47114534681 rad
Angle ∠ C = γ = 134.7932833702° = 134°47'34″ = 2.35325787562 rad

Height: ha = 11.35545418153
Height: hb = 7.8066247498
Height: hc = 4.99659983987

Median: ma = 20.25546291005
Median: mb = 17.57883958312
Median: mc = 5.67989083458

Inradius: r = 2.40219223071
Circumradius: R = 17.61440969186

Vertex coordinates: A[25; 0] B[0; 0] C[9.8; 4.99659983987]
Centroid: CG[11.6; 1.66553327996]
Coordinates of the circumscribed circle: U[12.5; -12.41099319199]
Coordinates of the inscribed circle: I[10; 2.40219223071]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 161.8055127661° = 161°48'18″ = 0.31875604293 rad
∠ B' = β' = 152.9887706041° = 152°59'16″ = 0.47114534681 rad
∠ C' = γ' = 45.20771662976° = 45°12'26″ = 2.35325787562 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.