# 16 18 30 triangle

### Obtuse scalene triangle.

Sides: a = 16   b = 18   c = 30

Area: T = 119.7333036377
Perimeter: p = 64
Semiperimeter: s = 32

Angle ∠ A = α = 26.32545765375° = 26°19'28″ = 0.45994505348 rad
Angle ∠ B = β = 29.92664348666° = 29°55'35″ = 0.52223148218 rad
Angle ∠ C = γ = 123.7498988596° = 123°44'56″ = 2.1659827297 rad

Height: ha = 14.96766295471
Height: hb = 13.30436707085
Height: hc = 7.98222024251

Median: ma = 23.40993998214
Median: mb = 22.29334968096
Median: mc = 8.06222577483

Inradius: r = 3.74216573868
Circumradius: R = 18.04401338291

Vertex coordinates: A[30; 0] B[0; 0] C[13.86766666667; 7.98222024251]
Centroid: CG[14.62222222222; 2.66107341417]
Coordinates of the circumscribed circle: U[15; -10.02222965717]
Coordinates of the inscribed circle: I[14; 3.74216573868]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 153.6755423463° = 153°40'32″ = 0.45994505348 rad
∠ B' = β' = 150.0743565133° = 150°4'25″ = 0.52223148218 rad
∠ C' = γ' = 56.25110114041° = 56°15'4″ = 2.1659827297 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.