9 9 12 triangle

Acute isosceles triangle.

Sides: a = 9   b = 9   c = 12

Area: T = 40.2499223595
Perimeter: p = 30
Semiperimeter: s = 15

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 = 8.944427191
Height: hb = 8.944427191
Height: hc = 6.70882039325

Median: ma = 9.60546863561
Median: mb = 9.60546863561
Median: mc = 6.70882039325

Inradius: r = 2.6833281573
Circumradius: R = 6.03773835392

Vertex coordinates: A[12; 0] B[0; 0] C[6; 6.70882039325]
Centroid: CG[6; 2.23660679775]
Coordinates of the circumscribed circle: U[6; 0.67108203932]
Coordinates of the inscribed circle: I[6; 2.6833281573]

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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