3 20 20 triangle

Acute isosceles triangle.

Sides: a = 3   b = 20   c = 20

Area: T = 29.91655060128
Perimeter: p = 43
Semiperimeter: s = 21.5

Angle ∠ A = α = 8.60224446093° = 8°36'9″ = 0.15501409822 rad
Angle ∠ B = β = 85.69987776953° = 85°41'56″ = 1.49657258357 rad
Angle ∠ C = γ = 85.69987776953° = 85°41'56″ = 1.49657258357 rad

Height: ha = 19.94436706752
Height: hb = 2.99215506013
Height: hc = 2.99215506013

Median: ma = 19.94436706752
Median: mb = 10.22325241501
Median: mc = 10.22325241501

Inradius: r = 1.39114188843
Circumradius: R = 10.02882442113

Vertex coordinates: A[20; 0] B[0; 0] C[0.225; 2.99215506013]
Centroid: CG[6.74216666667; 0.99771835338]
Coordinates of the circumscribed circle: U[10; 0.75221183158]
Coordinates of the inscribed circle: I[1.5; 1.39114188843]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 171.3987555391° = 171°23'51″ = 0.15501409822 rad
∠ B' = β' = 94.30112223047° = 94°18'4″ = 1.49657258357 rad
∠ C' = γ' = 94.30112223047° = 94°18'4″ = 1.49657258357 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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