Triangle calculator SSS - result

Please enter the triangle sides:

Acute isosceles triangle.

Sides: a = 6.3   b = 6.3   c = 7.76

Area: T = 19.25880937956
Perimeter: p = 20.36
Semiperimeter: s = 10.18

Angle ∠ A = α = 51.98546174028° = 51°59'5″ = 0.90773027341 rad
Angle ∠ B = β = 51.98546174028° = 51°59'5″ = 0.90773027341 rad
Angle ∠ C = γ = 76.03107651944° = 76°1'51″ = 1.32769871855 rad

Height: ha = 6.114368057
Height: hb = 6.114368057
Height: hc = 4.9633426236

Median: ma = 6.32770293187
Median: mb = 6.32770293187
Median: mc = 4.9633426236

Inradius: r = 1.89217577402
Circumradius: R = 3.99882461825

Vertex coordinates: A[7.76; 0] B[0; 0] C[3.88; 4.9633426236]
Centroid: CG[3.88; 1.6544475412]
Coordinates of the circumscribed circle: U[3.88; 0.96551800535]
Coordinates of the inscribed circle: I[3.88; 1.89217577402]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 128.0155382597° = 128°55″ = 0.90773027341 rad
∠ B' = β' = 128.0155382597° = 128°55″ = 0.90773027341 rad
∠ C' = γ' = 103.9699234806° = 103°58'9″ = 1.32769871855 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     