# 17 23 30 triangle

### Obtuse scalene triangle.

Sides: a = 17   b = 23   c = 30

Area: T = 194.4222220952
Perimeter: p = 70
Semiperimeter: s = 35

Angle ∠ A = α = 34.30111527568° = 34°18'4″ = 0.59986680528 rad
Angle ∠ B = β = 49.687978493° = 49°40'47″ = 0.86770758187 rad
Angle ∠ C = γ = 96.01990623132° = 96°1'9″ = 1.6765848782 rad

Height: ha = 22.8733202465
Height: hb = 16.90662800828
Height: hc = 12.96114813968

Median: ma = 25.34326517949
Median: mb = 21.5
Median: mc = 13.56546599663

Inradius: r = 5.55549205986
Circumradius: R = 15.08331524588

Vertex coordinates: A[30; 0] B[0; 0] C[11; 12.96114813968]
Centroid: CG[13.66766666667; 4.32204937989]
Coordinates of the circumscribed circle: U[15; -1.58216093371]
Coordinates of the inscribed circle: I[12; 5.55549205986]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 145.6998847243° = 145°41'56″ = 0.59986680528 rad
∠ B' = β' = 130.322021507° = 130°19'13″ = 0.86770758187 rad
∠ C' = γ' = 83.98109376868° = 83°58'51″ = 1.6765848782 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.