1.5 1.5 0.78 triangle

Acute isosceles triangle.

Sides: a = 1.5   b = 1.5   c = 0.78

Area: T = 0.56548810406
Perimeter: p = 3.78
Semiperimeter: s = 1.89

Angle ∠ A = α = 74.93299378551° = 74°55'48″ = 1.30877741239 rad
Angle ∠ B = β = 74.93299378551° = 74°55'48″ = 1.30877741239 rad
Angle ∠ C = γ = 30.14401242898° = 30°8'24″ = 0.52660444058 rad

Height: ha = 0.75331747208
Height: hb = 0.75331747208
Height: hc = 1.44884129245

Median: ma = 0.9310967239
Median: mb = 0.9310967239
Median: mc = 1.44884129245

Inradius: r = 0.29988788574
Circumradius: R = 0.77767122075

Vertex coordinates: A[0.78; 0] B[0; 0] C[0.39; 1.44884129245]
Centroid: CG[0.39; 0.48328043082]
Coordinates of the circumscribed circle: U[0.39; 0.6721700717]
Coordinates of the inscribed circle: I[0.39; 0.29988788574]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 105.0770062145° = 105°4'12″ = 1.30877741239 rad
∠ B' = β' = 105.0770062145° = 105°4'12″ = 1.30877741239 rad
∠ C' = γ' = 149.865987571° = 149°51'36″ = 0.52660444058 rad

How did we calculate this triangle?

Now we know the lengths of all three sides of the triangle and the triangle is uniquely determined. Next we calculate another its characteristics - same procedure as calculation of the triangle from the known three sides SSS. 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     