# Triangle calculator VC

Please enter the coordinates of the three vertices

### Obtuse scalene triangle.

Sides: a = 9.48768329805   b = 3.60655512755   c = 12.04215945788

Area: T = 13.5
Perimeter: p = 25.13439788348
Semiperimeter: s = 12.56769894174

Angle ∠ A = α = 38.45437092167° = 38°27'13″ = 0.67111438354 rad
Angle ∠ B = β = 13.67113071322° = 13°40'17″ = 0.23986093225 rad
Angle ∠ C = γ = 127.8754983651° = 127°52'30″ = 2.23218394956 rad

Height: ha = 2.84660498942
Height: hb = 7.4888452649
Height: hc = 2.24222279561

Median: ma = 7.51766481892
Median: mb = 10.68987791632
Median: mc = 3.9055124838

Inradius: r = 1.07442429672
Circumradius: R = 7.62875167876

Vertex coordinates: A[1; -5] B[2; 7] C[-1; -2]
Centroid: CG[0.66766666667; 0]
Coordinates of the circumscribed circle: U[0; 0]
Coordinates of the inscribed circle: I[4.41663321983; 1.07442429672]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 141.5466290783° = 141°32'47″ = 0.67111438354 rad
∠ B' = β' = 166.3298692868° = 166°19'43″ = 0.23986093225 rad
∠ C' = γ' = 52.12550163489° = 52°7'30″ = 2.23218394956 rad

# How did we calculate this triangle?

### 1. We compute side a from coordinates using the Pythagorean theorem ### 2. We compute side b from coordinates using the Pythagorean theorem ### 3. We compute side c from coordinates using the Pythagorean theorem 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. ### 4. The triangle circumference is the sum of the lengths of its three sides ### 5. Semiperimeter of the triangle ### 6. The triangle area using Heron's formula ### 7. Calculate the heights of the triangle from its area. ### 8. Calculation of the inner angles of the triangle using a Law of Cosines ### 9. Inradius ### 10. Circumradius ### 11. 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.