7 18 21 triangle

Obtuse scalene triangle.

Sides: a = 7   b = 18   c = 21

Area: T = 60.66330035524
Perimeter: p = 46
Semiperimeter: s = 23

Angle ∠ A = α = 18.721149202° = 18°43'17″ = 0.32767516766 rad
Angle ∠ B = β = 55.62436862764° = 55°37'25″ = 0.97108164676 rad
Angle ∠ C = γ = 105.6554821704° = 105°39'17″ = 1.84440245093 rad

Height: ha = 17.33222867293
Height: hb = 6.7440333728
Height: hc = 5.77774289098

Median: ma = 19.24218814049
Median: mb = 12.80662484749
Median: mc = 8.73221245983

Inradius: r = 2.63875218936
Circumradius: R = 10.90545045788

Vertex coordinates: A[21; 0] B[0; 0] C[3.95223809524; 5.77774289098]
Centroid: CG[8.31774603175; 1.92658096366]
Coordinates of the circumscribed circle: U[10.5; -2.94224853625]
Coordinates of the inscribed circle: I[5; 2.63875218936]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 161.279850798° = 161°16'43″ = 0.32767516766 rad
∠ B' = β' = 124.3766313724° = 124°22'35″ = 0.97108164676 rad
∠ C' = γ' = 74.34551782964° = 74°20'43″ = 1.84440245093 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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