# 9 18 22 triangle

### Obtuse scalene triangle.

Sides: a = 9   b = 18   c = 22

Area: T = 78.55553149061
Perimeter: p = 49
Semiperimeter: s = 24.5

Angle ∠ A = α = 23.37547882659° = 23°22'29″ = 0.40879670172 rad
Angle ∠ B = β = 52.51326785757° = 52°30'46″ = 0.91765191402 rad
Angle ∠ C = γ = 104.1132533158° = 104°6'45″ = 1.81771064962 rad

Height: ha = 17.45767366458
Height: hb = 8.72883683229
Height: hc = 7.14113922642

Median: ma = 19.59895380242
Median: mb = 14.19550695666
Median: mc = 9.02877350426

Inradius: r = 3.20663393839
Circumradius: R = 11.34223261184

Vertex coordinates: A[22; 0] B[0; 0] C[5.47772727273; 7.14113922642]
Centroid: CG[9.15990909091; 2.38804640881]
Coordinates of the circumscribed circle: U[11; -2.76655671708]
Coordinates of the inscribed circle: I[6.5; 3.20663393839]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 156.6255211734° = 156°37'31″ = 0.40879670172 rad
∠ B' = β' = 127.4877321424° = 127°29'14″ = 0.91765191402 rad
∠ C' = γ' = 75.88774668416° = 75°53'15″ = 1.81771064962 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.