# 9 9 16 triangle

### Obtuse isosceles triangle.

Sides: a = 9   b = 9   c = 16

Area: T = 32.98548450049
Perimeter: p = 34
Semiperimeter: s = 17

Angle ∠ A = α = 27.26660444507° = 27°15'58″ = 0.47658822497 rad
Angle ∠ B = β = 27.26660444507° = 27°15'58″ = 0.47658822497 rad
Angle ∠ C = γ = 125.4687911099° = 125°28'4″ = 2.19898281543 rad

Height: ha = 7.33299655567
Height: hb = 7.33299655567
Height: hc = 4.12331056256

Median: ma = 12.17657956619
Median: mb = 12.17657956619
Median: mc = 4.12331056256

Inradius: r = 1.94402850003
Circumradius: R = 9.8232692814

Vertex coordinates: A[16; 0] B[0; 0] C[8; 4.12331056256]
Centroid: CG[8; 1.37443685419]
Coordinates of the circumscribed circle: U[8; -5.76995871884]
Coordinates of the inscribed circle: I[8; 1.94402850003]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 152.7343955549° = 152°44'2″ = 0.47658822497 rad
∠ B' = β' = 152.7343955549° = 152°44'2″ = 0.47658822497 rad
∠ C' = γ' = 54.53220889015° = 54°31'56″ = 2.19898281543 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.