# 2 15 16 triangle

### Obtuse scalene triangle.

Sides: a = 2   b = 15   c = 16

Area: T = 13.39554283246
Perimeter: p = 33
Semiperimeter: s = 16.5

Angle ∠ A = α = 6.40992039782° = 6°24'33″ = 0.11218617119 rad
Angle ∠ B = β = 56.84771120714° = 56°50'50″ = 0.99221692759 rad
Angle ∠ C = γ = 116.744368395° = 116°44'37″ = 2.03875616658 rad

Height: ha = 13.39554283246
Height: hb = 1.78660571099
Height: hc = 1.67444285406

Median: ma = 15.47657875405
Median: mb = 8.58877820187
Median: mc = 7.10663352018

Inradius: r = 0.81218441409
Circumradius: R = 8.95882801753

Vertex coordinates: A[16; 0] B[0; 0] C[1.094375; 1.67444285406]
Centroid: CG[5.69879166667; 0.55881428469]
Coordinates of the circumscribed circle: U[8; -4.03112260789]
Coordinates of the inscribed circle: I[1.5; 0.81218441409]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 173.5910796022° = 173°35'27″ = 0.11218617119 rad
∠ B' = β' = 123.1532887929° = 123°9'10″ = 0.99221692759 rad
∠ C' = γ' = 63.25663160496° = 63°15'23″ = 2.03875616658 rad

# How did we calculate this triangle?

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. ### 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 ### 6. Inradius ### 7. Circumradius ### 8. 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.