Triangle calculator SSS - result

Please enter the triangle sides:

Acute isosceles triangle.

Sides: a = 6   b = 7   c = 7

Area: T = 18.9743665961
Perimeter: p = 20
Semiperimeter: s = 10

Angle ∠ A = α = 50.75438670503° = 50°45'14″ = 0.88658220881 rad
Angle ∠ B = β = 64.62330664748° = 64°37'23″ = 1.12878852827 rad
Angle ∠ C = γ = 64.62330664748° = 64°37'23″ = 1.12878852827 rad

Height: ha = 6.32545553203
Height: hb = 5.42110474174
Height: hc = 5.42110474174

Median: ma = 6.32545553203
Median: mb = 5.5
Median: mc = 5.5

Inradius: r = 1.89773665961
Circumradius: R = 3.87437901337

Vertex coordinates: A[7; 0] B[0; 0] C[2.57114285714; 5.42110474174]
Centroid: CG[3.19904761905; 1.80770158058]
Coordinates of the circumscribed circle: U[3.5; 1.66601957716]
Coordinates of the inscribed circle: I[3; 1.89773665961]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 129.246613295° = 129°14'46″ = 0.88658220881 rad
∠ B' = β' = 115.3776933525° = 115°22'37″ = 1.12878852827 rad
∠ C' = γ' = 115.3776933525° = 115°22'37″ = 1.12878852827 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    