3 21 21 triangle

Acute isosceles triangle.

Sides: a = 3   b = 21   c = 21

Area: T = 31.42195400985
Perimeter: p = 45
Semiperimeter: s = 22.5

Angle ∠ A = α = 8.19220875163° = 8°11'32″ = 0.14329788998 rad
Angle ∠ B = β = 85.90439562418° = 85°54'14″ = 1.49993068769 rad
Angle ∠ C = γ = 85.90439562418° = 85°54'14″ = 1.49993068769 rad

Height: ha = 20.94663600657
Height: hb = 2.99223371522
Height: hc = 2.99223371522

Median: ma = 20.94663600657
Median: mb = 10.71221426428
Median: mc = 10.71221426428

Inradius: r = 1.39664240044
Circumradius: R = 10.52768886484

Vertex coordinates: A[21; 0] B[0; 0] C[0.21442857143; 2.99223371522]
Centroid: CG[7.07114285714; 0.99774457174]
Coordinates of the circumscribed circle: U[10.5; 0.75219206177]
Coordinates of the inscribed circle: I[1.5; 1.39664240044]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 171.8087912484° = 171°48'28″ = 0.14329788998 rad
∠ B' = β' = 94.09660437582° = 94°5'46″ = 1.49993068769 rad
∠ C' = γ' = 94.09660437582° = 94°5'46″ = 1.49993068769 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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