Triangle calculator

Please enter what you know about the triangle:
You have entered side a, b and c.

Obtuse scalene triangle.

Sides: a = 98   b = 76   c = 57

Area: T = 2161.158789277
Perimeter: p = 231
Semiperimeter: s = 115.5

Angle ∠ A = α = 93.83218327432° = 93°49'55″ = 1.63876744245 rad
Angle ∠ B = β = 50.69442413116° = 50°41'39″ = 0.88547814227 rad
Angle ∠ C = γ = 35.47439259452° = 35°28'26″ = 0.61991368064 rad

Height: ha = 44.10552631178
Height: hb = 56.87325761256
Height: hc = 75.83301015008

Median: ma = 45.95110609236
Median: mb = 70.58768259663
Median: mc = 82.93222012249

Inradius: r = 18.7111323747
Circumradius: R = 49.11097852475

Vertex coordinates: A[57; 0] B[0; 0] C[62.07989473684; 75.83301015008]
Centroid: CG[39.69329824561; 25.27767005003]
Coordinates of the circumscribed circle: U[28.5; 39.994401214]
Coordinates of the inscribed circle: I[39.5; 18.7111323747]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 86.16881672568° = 86°10'5″ = 1.63876744245 rad
∠ B' = β' = 129.3065758688° = 129°18'21″ = 0.88547814227 rad
∠ C' = γ' = 144.5266074055° = 144°31'34″ = 0.61991368064 rad

How did we calculate this triangle?

1. Input data entered: side a, b and c. 2. The triangle circumference is the sum of the lengths of its three sides 3. Semiperimeter of the triangle 4. The triangle area using Heron's formula 5. Calculate the heights of the triangle from its area. 6. Calculation of the inner angles of the triangle using a Law of Cosines     