15 15 20 triangle

Acute isosceles triangle.

Sides: a = 15   b = 15   c = 20

Area: T = 111.8033398875
Perimeter: p = 50
Semiperimeter: s = 25

Angle ∠ A = α = 48.19896851042° = 48°11'23″ = 0.84110686706 rad
Angle ∠ B = β = 48.19896851042° = 48°11'23″ = 0.84110686706 rad
Angle ∠ C = γ = 83.62106297916° = 83°37'14″ = 1.45994553125 rad

Height: ha = 14.907711985
Height: hb = 14.907711985
Height: hc = 11.18803398875

Median: ma = 16.00878105936
Median: mb = 16.00878105936
Median: mc = 11.18803398875

Inradius: r = 4.4722135955
Circumradius: R = 10.06223058987

Vertex coordinates: A[20; 0] B[0; 0] C[10; 11.18803398875]
Centroid: CG[10; 3.72767799625]
Coordinates of the circumscribed circle: U[10; 1.11880339887]
Coordinates of the inscribed circle: I[10; 4.4722135955]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 131.8110314896° = 131°48'37″ = 0.84110686706 rad
∠ B' = β' = 131.8110314896° = 131°48'37″ = 0.84110686706 rad
∠ C' = γ' = 96.37993702084° = 96°22'46″ = 1.45994553125 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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