# 7 25 26 triangle

### Obtuse scalene triangle.

Sides: a = 7   b = 25   c = 26

Area: T = 87.49985714169
Perimeter: p = 58
Semiperimeter: s = 29

Angle ∠ A = α = 15.61882367682° = 15°37'6″ = 0.2732589655 rad
Angle ∠ B = β = 74.05443569956° = 74°3'16″ = 1.2922492355 rad
Angle ∠ C = γ = 90.32774062362° = 90°19'39″ = 1.57765106436 rad

Height: ha = 254.9995918334
Height: hb = 76.9998857134
Height: hc = 6.73106593398

Median: ma = 25.26436101933
Median: mb = 14.36114066163
Median: mc = 12.96114813968

Inradius: r = 3.01771921178
Circumradius: R = 133.0002122501

Vertex coordinates: A[26; 0] B[0; 0] C[1.92330769231; 6.73106593398]
Centroid: CG[9.30876923077; 2.24435531133]
Coordinates of the circumscribed circle: U[13; -0.07442869271]
Coordinates of the inscribed circle: I[4; 3.01771921178]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 164.3821763232° = 164°22'54″ = 0.2732589655 rad
∠ B' = β' = 105.9465643004° = 105°56'44″ = 1.2922492355 rad
∠ C' = γ' = 89.67325937638° = 89°40'21″ = 1.57765106436 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.