Triangle calculator SSS - result

Please enter the triangle sides:

Acute isosceles triangle.

Sides: a = 5   b = 5   c = 7

Area: T = 12.497749975
Perimeter: p = 17
Semiperimeter: s = 8.5

Angle ∠ A = α = 45.57329959992° = 45°34'23″ = 0.79553988302 rad
Angle ∠ B = β = 45.57329959992° = 45°34'23″ = 0.79553988302 rad
Angle ∠ C = γ = 88.85440080016° = 88°51'14″ = 1.55107949932 rad

Height: ha = 4.99989999
Height: hb = 4.99989999
Height: hc = 3.57107142143

Median: ma = 5.54552682532
Median: mb = 5.54552682532
Median: mc = 3.57107142143

Inradius: r = 1.47702940882
Circumradius: R = 3.50107002101

Vertex coordinates: A[7; 0] B[0; 0] C[3.5; 3.57107142143]
Centroid: CG[3.5; 1.19902380714]
Coordinates of the circumscribed circle: U[3.5; 0.07700140042]
Coordinates of the inscribed circle: I[3.5; 1.47702940882]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 134.4277004001° = 134°25'37″ = 0.79553988302 rad
∠ B' = β' = 134.4277004001° = 134°25'37″ = 0.79553988302 rad
∠ C' = γ' = 91.14659919984° = 91°8'46″ = 1.55107949932 rad

How did we calculate this triangle?

1. The triangle circumference is the sum of the lengths of its three sides 2. Semiperimeter of the triangle 3. The triangle area using Heron's formula 4. Calculate the heights of the triangle from its area. 5. Calculation of the inner angles of the triangle using a Law of Cosines    