# Triangle calculator SSS - result

Please enter the triangle sides:

### Acute isosceles triangle.

Sides: a = 18   b = 22   c = 22

Area: T = 180.6743739099
Perimeter: p = 62
Semiperimeter: s = 31

Angle ∠ A = α = 48.2955479834° = 48°17'44″ = 0.84329151369 rad
Angle ∠ B = β = 65.8522260083° = 65°51'8″ = 1.14993387583 rad
Angle ∠ C = γ = 65.8522260083° = 65°51'8″ = 1.14993387583 rad

Height: ha = 20.07548598999
Height: hb = 16.42548853726
Height: hc = 16.42548853726

Median: ma = 20.07548598999
Median: mb = 16.82326038413
Median: mc = 16.82326038413

Inradius: r = 5.82881851322
Circumradius: R = 12.05548786496

Vertex coordinates: A[22; 0] B[0; 0] C[7.36436363636; 16.42548853726]
Centroid: CG[9.78878787879; 5.47549617909]
Coordinates of the circumscribed circle: U[11; 4.93215412657]
Coordinates of the inscribed circle: I[9; 5.82881851322]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 131.7054520166° = 131°42'16″ = 0.84329151369 rad
∠ B' = β' = 114.1487739917° = 114°8'52″ = 1.14993387583 rad
∠ C' = γ' = 114.1487739917° = 114°8'52″ = 1.14993387583 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   