Triangle calculator SSS - result

Please enter the triangle sides:

Acute isosceles triangle.

Sides: a = 166.16   b = 166.16   c = 200

Area: T = 13269.94655914
Perimeter: p = 532.32
Semiperimeter: s = 266.16

Angle ∠ A = α = 52.9998956955° = 52°59'56″ = 0.9255006299 rad
Angle ∠ B = β = 52.9998956955° = 52°59'56″ = 0.9255006299 rad
Angle ∠ C = γ = 74.002208609° = 74°8″ = 1.29215800556 rad

Height: ha = 159.7254910826
Height: hb = 159.7254910826
Height: hc = 132.6999455914

Median: ma = 164.0199164734
Median: mb = 164.0199164734
Median: mc = 132.6999455914

Inradius: r = 49.85770243141
Circumradius: R = 104.0298857578

Vertex coordinates: A[200; 0] B[0; 0] C[100; 132.6999455914]
Centroid: CG[100; 44.23331519715]
Coordinates of the circumscribed circle: U[100; 28.67105983365]
Coordinates of the inscribed circle: I[100; 49.85770243141]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 127.0011043045° = 127°4″ = 0.9255006299 rad
∠ B' = β' = 127.0011043045° = 127°4″ = 0.9255006299 rad
∠ C' = γ' = 105.998791391° = 105°59'52″ = 1.29215800556 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     