7 16 21 triangle

Obtuse scalene triangle.

Sides: a = 7   b = 16   c = 21

Area: T = 44.49771909226
Perimeter: p = 44
Semiperimeter: s = 22

Angle ∠ A = α = 15.35988855808° = 15°21'32″ = 0.26880631228 rad
Angle ∠ B = β = 37.25879160013° = 37°15'29″ = 0.65502733067 rad
Angle ∠ C = γ = 127.3833198418° = 127°23' = 2.22332562241 rad

Height: ha = 12.71334831207
Height: hb = 5.56221488653
Height: hc = 4.23878277069

Median: ma = 18.33771208209
Median: mb = 13.45436240471
Median: mc = 6.5

Inradius: r = 2.02325995874
Circumradius: R = 13.21443173043

Vertex coordinates: A[21; 0] B[0; 0] C[5.57114285714; 4.23878277069]
Centroid: CG[8.85771428571; 1.41326092356]
Coordinates of the circumscribed circle: U[10.5; -8.02329783633]
Coordinates of the inscribed circle: I[6; 2.02325995874]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 164.6411114419° = 164°38'28″ = 0.26880631228 rad
∠ B' = β' = 142.7422083999° = 142°44'31″ = 0.65502733067 rad
∠ C' = γ' = 52.61768015821° = 52°37' = 2.22332562241 rad

Calculate another triangle




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.


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