Triangle calculator

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

Obtuse scalene triangle.

Sides: a = 3.6   b = 7.9   c = 6.6

Area: T = 11.78883902103
Perimeter: p = 18.1
Semiperimeter: s = 9.05

Angle ∠ A = α = 26.88437786993° = 26°53'2″ = 0.46992104537 rad
Angle ∠ B = β = 97.12199972892° = 97°7'12″ = 1.69550637222 rad
Angle ∠ C = γ = 55.99662240115° = 55°59'46″ = 0.97773184777 rad

Height: ha = 6.54991056724
Height: hb = 2.98444025849
Height: hc = 3.57222394577

Median: ma = 7.05330135403
Median: mb = 3.55877380454
Median: mc = 5.17663887026

Inradius: r = 1.30325845536
Circumradius: R = 3.98106961903

Vertex coordinates: A[6.6; 0] B[0; 0] C[-0.44662121212; 3.57222394577]
Centroid: CG[2.05112626263; 1.19107464859]
Coordinates of the circumscribed circle: U[3.3; 2.22661945467]
Coordinates of the inscribed circle: I[1.15; 1.30325845536]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 153.1166221301° = 153°6'58″ = 0.46992104537 rad
∠ B' = β' = 82.88800027108° = 82°52'48″ = 1.69550637222 rad
∠ C' = γ' = 124.0043775989° = 124°14″ = 0.97773184777 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     