# Triangle calculator VC

Please enter the coordinates of the three vertices

### Obtuse scalene triangle.

Sides: a = 16.24880768093   b = 28.19657443597   c = 12.1244355653

Area: T = 22.0455407685
Perimeter: p = 56.5688176822
Semiperimeter: s = 28.2844088411

Angle ∠ A = α = 7.41103717247° = 7°24'37″ = 0.12993353854 rad
Angle ∠ B = β = 167.0676845508° = 167°4'1″ = 2.9165866525 rad
Angle ∠ C = γ = 5.52327827672° = 5°31'22″ = 0.09663907432 rad

Height: ha = 2.71436021012
Height: hb = 1.56437400739
Height: hc = 3.63765491604

Median: ma = 20.12546117975
Median: mb = 2.59880762114
Median: mc = 22.19879728804

Vertex coordinates: A[1; 4; -7] B[2; -1; 4] C[0; -9; 18]
Centroid: CG[1; -2; 5]
Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 172.5989628275° = 172°35'23″ = 0.12993353854 rad
∠ B' = β' = 12.93331544919° = 12°55'59″ = 2.9165866525 rad
∠ C' = γ' = 174.4777217233° = 174°28'38″ = 0.09663907432 rad

# How did we calculate this triangle?

### 3. We compute side c from coordinates using the Pythagorean theorem

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.