# Triangle calculator

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

### Obtuse scalene triangle.

Sides: a = 3.2   b = 7.6   c = 6.4

Area: T = 10.10878187558
Perimeter: p = 17.2
Semiperimeter: s = 8.6

Angle ∠ A = α = 24.55882124119° = 24°33'30″ = 0.4298621665 rad
Angle ∠ B = β = 99.2165965643° = 99°12'57″ = 1.7321645271 rad
Angle ∠ C = γ = 56.22658219451° = 56°13'33″ = 0.98113257176 rad

Height: ha = 6.31773867224
Height: hb = 2.66599523042
Height: hc = 3.15986933612

Median: ma = 6.84110525506
Median: mb = 3.34106586177
Median: mc = 4.87444230428

Inradius: r = 1.17553277623
Circumradius: R = 3.85496930881

Vertex coordinates: A[6.4; 0] B[0; 0] C[-0.51225; 3.15986933612]
Centroid: CG[1.96325; 1.05328977871]
Coordinates of the circumscribed circle: U[3.2; 2.14401254338]
Coordinates of the inscribed circle: I[1; 1.17553277623]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 155.4421787588° = 155°26'30″ = 0.4298621665 rad
∠ B' = β' = 80.7844034357° = 80°47'3″ = 1.7321645271 rad
∠ C' = γ' = 123.7744178055° = 123°46'27″ = 0.98113257176 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 ### 7. Inradius ### 8. Circumradius ### 9. Calculation of medians #### Look also our friend's collection of math examples and problems:

See more informations about triangles or more information about solving triangles.