5 18 18 triangle

Acute isosceles triangle.

Sides: a = 5   b = 18   c = 18

Area: T = 44.56438586749
Perimeter: p = 41
Semiperimeter: s = 20.5

Angle ∠ A = α = 15.96771122911° = 15°58'2″ = 0.27986786815 rad
Angle ∠ B = β = 82.01664438544° = 82°59″ = 1.4311456986 rad
Angle ∠ C = γ = 82.01664438544° = 82°59″ = 1.4311456986 rad

Height: ha = 17.826554347
Height: hb = 4.95215398528
Height: hc = 4.95215398528

Median: ma = 17.826554347
Median: mb = 9.67695398029
Median: mc = 9.67695398029

Inradius: r = 2.17438467646
Circumradius: R = 9.08880819579

Vertex coordinates: A[18; 0] B[0; 0] C[0.69444444444; 4.95215398528]
Centroid: CG[6.23114814815; 1.65105132843]
Coordinates of the circumscribed circle: U[9; 1.26222336053]
Coordinates of the inscribed circle: I[2.5; 2.17438467646]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 164.0332887709° = 164°1'58″ = 0.27986786815 rad
∠ B' = β' = 97.98435561456° = 97°59'1″ = 1.4311456986 rad
∠ C' = γ' = 97.98435561456° = 97°59'1″ = 1.4311456986 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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