# 7 11 17 triangle

### Obtuse scalene triangle.

Sides: a = 7   b = 11   c = 17

Area: T = 24.43774200766
Perimeter: p = 35
Semiperimeter: s = 17.5

Angle ∠ A = α = 15.15109401512° = 15°9'3″ = 0.26444337904 rad
Angle ∠ B = β = 24.25496286025° = 24°14'59″ = 0.42332358615 rad
Angle ∠ C = γ = 140.5999431246° = 140°35'58″ = 2.45439230017 rad

Height: ha = 6.98221200219
Height: hb = 4.44331672867
Height: hc = 2.87549905972

Median: ma = 13.88334433769
Median: mb = 11.77992189894
Median: mc = 3.57107142143

Inradius: r = 1.39664240044
Circumradius: R = 13.39113481445

Vertex coordinates: A[17; 0] B[0; 0] C[6.38223529412; 2.87549905972]
Centroid: CG[7.79441176471; 0.95883301991]
Coordinates of the circumscribed circle: U[8.5; -10.34878599299]
Coordinates of the inscribed circle: I[6.5; 1.39664240044]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 164.8499059849° = 164°50'57″ = 0.26444337904 rad
∠ B' = β' = 155.7550371397° = 155°45'1″ = 0.42332358615 rad
∠ C' = γ' = 39.40105687537° = 39°24'2″ = 2.45439230017 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.