Obtuse scalene triangle.

Sides: a = 8   b = 16   c = 21

Area: T = 56.43998005316
Perimeter: p = 45
Semiperimeter: s = 22.5

Angle ∠ A = α = 19.61659069161° = 19°36'57″ = 0.34223621615 rad
Angle ∠ B = β = 42.17772350071° = 42°10'38″ = 0.73661316203 rad
Angle ∠ C = γ = 118.2076858077° = 118°12'25″ = 2.06330988719 rad

Height: h_a = 14.10999501329
Height: h_b = 7.05499750664
Height: h_c = 5.37114095744

Median: m_a = 18.23545825288
Median: m_b = 13.73295302177
Median: m_c = 7.05333679898

Inradius: r = 2.50766578014
Circumradius: R = 11.91549357563

Vertex coordinates: A[21; 0] B[0; 0] C[5.92985714286; 5.37114095744]
Centroid: CG[8.97661904762; 1.79904698581]
Coordinates of the circumscribed circle: U[10.5; -5.63216688535]
Coordinates of the inscribed circle: I[6.5; 2.50766578014]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 160.3844093084° = 160°23'3″ = 0.34223621615 rad
∠ B' = β' = 137.8232764993° = 137°49'22″ = 0.73661316203 rad
∠ C' = γ' = 61.79331419232° = 61°47'35″ = 2.06330988719 rad

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