Answer: No 6,9,12 are not a right triangle
Step-by-step explanation:
Obtuse scalene triangle.
Sides: a = 6 b = 9 c = 12
Area: T = 26.143
Perimeter: p = 27
Semiperimeter: s = 13.5
Angle ∠ A = α = 28.955° = 28°57'18″ = 0.505 rad
Angle ∠ B = β = 46.567° = 46°34'3″ = 0.813 rad
Angle ∠ C = γ = 104.478° = 104°28'39″ = 1.823 rad
Height: ha = 8.714
Height: hb = 5.809
Height: hc = 4.357
Median: ma = 10.173
Median: mb = 8.352
Median: mc = 4.743
Inradius: r = 1.936
Circumradius: R = 6.197
Vertex coordinates: A[12; 0] B[0; 0] C[4.125; 4.357]
Centroid: CG[5.375; 1.452]
Coordinates of the circumscribed circle: U[6; -1.549]
Coordinates of the inscribed circle: I[4.5; 1.936]
Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 151.045° = 151°2'42″ = 0.505 rad
∠ B' = β' = 133.433° = 133°25'57″ = 0.813 rad
∠ C' = γ' = 75.522° = 75°31'21″ = 1.823 rad
