Triangle calculator SSS - result

Please enter the triangle sides:

Obtuse scalene triangle.

Sides: a = 7   b = 23   c = 25

Area: T = 79.6387852181
Perimeter: p = 55
Semiperimeter: s = 27.5

Angle ∠ A = α = 16.08113096745° = 16°4'53″ = 0.28106718019 rad
Angle ∠ B = β = 65.52656574372° = 65°31'32″ = 1.14436384668 rad
Angle ∠ C = γ = 98.39330328884° = 98°23'35″ = 1.71772823849 rad

Height: ha = 22.75436720517
Height: hb = 6.92550306244
Height: hc = 6.37110281745

Median: ma = 23.76444692766
Median: mb = 14.30990880213
Median: mc = 11.52217186218

Inradius: r = 2.89659218975
Circumradius: R = 12.63553231842

Vertex coordinates: A[25; 0] B[0; 0] C[2.9; 6.37110281745]
Centroid: CG[9.3; 2.12436760582]
Coordinates of the circumscribed circle: U[12.5; -1.84442863033]
Coordinates of the inscribed circle: I[4.5; 2.89659218975]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 163.9198690326° = 163°55'7″ = 0.28106718019 rad
∠ B' = β' = 114.4744342563° = 114°28'28″ = 1.14436384668 rad
∠ C' = γ' = 81.60769671116° = 81°36'25″ = 1.71772823849 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     