# 8.3 8.1 0.75 triangle

### Obtuse scalene triangle.

Sides: a = 8.3   b = 8.1   c = 0.75

Area: T = 2.96105499252
Perimeter: p = 17.15
Semiperimeter: s = 8.575

Angle ∠ A = α = 102.9244243841° = 102°55'27″ = 1.79663669351 rad
Angle ∠ B = β = 72.02330393212° = 72°1'23″ = 1.25770391734 rad
Angle ∠ C = γ = 5.0532716838° = 5°3'10″ = 0.0888186545 rad

Height: ha = 0.71333855241
Height: hb = 0.73109999815
Height: hc = 7.89547998004

Median: ma = 3.98329323369
Median: mb = 4.28106249544
Median: mc = 8.19220311889

Inradius: r = 0.34552536356
Circumradius: R = 4.25878660447

Vertex coordinates: A[0.75; 0] B[0; 0] C[2.56216666667; 7.89547998004]
Centroid: CG[1.10438888889; 2.63215999335]
Coordinates of the circumscribed circle: U[0.375; 4.24113203433]
Coordinates of the inscribed circle: I[0.475; 0.34552536356]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 77.07657561592° = 77°4'33″ = 1.79663669351 rad
∠ B' = β' = 107.9776960679° = 107°58'37″ = 1.25770391734 rad
∠ C' = γ' = 174.9477283162° = 174°56'50″ = 0.0888186545 rad

# How did we calculate this triangle?

### 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    