5 7 7 triangle
Acute isosceles triangle.
Sides: a = 5 b = 7 c = 7Area: T = 16.34658710383
Perimeter: p = 19
Semiperimeter: s = 9.5
Angle ∠ A = α = 41.85496648553° = 41°50'59″ = 0.73304144426 rad
Angle ∠ B = β = 69.07551675724° = 69°4'31″ = 1.20655891055 rad
Angle ∠ C = γ = 69.07551675724° = 69°4'31″ = 1.20655891055 rad
Height: ha = 6.53883484153
Height: hb = 4.67702488681
Height: hc = 4.67702488681
Median: ma = 6.53883484153
Median: mb = 4.97549371855
Median: mc = 4.97549371855
Inradius: r = 1.7210618004
Circumradius: R = 3.74771236532
Vertex coordinates: A[7; 0] B[0; 0] C[1.78657142857; 4.67702488681]
Centroid: CG[2.92985714286; 1.55767496227]
Coordinates of the circumscribed circle: U[3.5; 1.33882584476]
Coordinates of the inscribed circle: I[2.5; 1.7210618004]
Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 138.1550335145° = 138°9'1″ = 0.73304144426 rad
∠ B' = β' = 110.9254832428° = 110°55'29″ = 1.20655891055 rad
∠ C' = γ' = 110.9254832428° = 110°55'29″ = 1.20655891055 rad
Calculate another triangle
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

6. Inradius

7. Circumradius
