# 6 20 25 triangle

### Obtuse scalene triangle.

Sides: a = 6   b = 20   c = 25

Area: T = 36.97988791069
Perimeter: p = 51
Semiperimeter: s = 25.5

Angle ∠ A = α = 8.50661469535° = 8°30'22″ = 0.1488460271 rad
Angle ∠ B = β = 29.54113605001° = 29°32'29″ = 0.51655940062 rad
Angle ∠ C = γ = 141.9522492546° = 141°57'9″ = 2.47875383763 rad

Height: ha = 12.32662930356
Height: hb = 3.69878879107
Height: hc = 2.95883103285

Median: ma = 22.43988056723
Median: mb = 15.18222264507
Median: mc = 7.85881168228

Inradius: r = 1.45501521218
Circumradius: R = 20.28218478579

Vertex coordinates: A[25; 0] B[0; 0] C[5.22; 2.95883103285]
Centroid: CG[10.07333333333; 0.98661034428]
Coordinates of the circumscribed circle: U[12.5; -15.97219551881]
Coordinates of the inscribed circle: I[5.5; 1.45501521218]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 171.4943853047° = 171°29'38″ = 0.1488460271 rad
∠ B' = β' = 150.45986395° = 150°27'31″ = 0.51655940062 rad
∠ C' = γ' = 38.04875074536° = 38°2'51″ = 2.47875383763 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.