# 8 25 30 triangle

### Obtuse scalene triangle.

Sides: a = 8   b = 25   c = 30

Area: T = 84.9565503059
Perimeter: p = 63
Semiperimeter: s = 31.5

Angle ∠ A = α = 13.09439233206° = 13°5'38″ = 0.22985320739 rad
Angle ∠ B = β = 45.06993816758° = 45°4'10″ = 0.78766091021 rad
Angle ∠ C = γ = 121.8376695004° = 121°50'12″ = 2.12664514776 rad

Height: ha = 21.23988757647
Height: hb = 6.79664402447
Height: hc = 5.66437002039

Median: ma = 27.32221521846
Median: mb = 18.04985456478
Median: mc = 10.93216055545

Inradius: r = 2.69770000971
Circumradius: R = 17.65663017814

Vertex coordinates: A[30; 0] B[0; 0] C[5.65; 5.66437002039]
Centroid: CG[11.88333333333; 1.8887900068]
Coordinates of the circumscribed circle: U[15; -9.31436991897]
Coordinates of the inscribed circle: I[6.5; 2.69770000971]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 166.9066076679° = 166°54'22″ = 0.22985320739 rad
∠ B' = β' = 134.9310618324° = 134°55'50″ = 0.78766091021 rad
∠ C' = γ' = 58.16333049964° = 58°9'48″ = 2.12664514776 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.