# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse isosceles triangle.

Sides: a = 13.18   b = 13.18   c = 18.64

Area: T = 86.85661997787
Perimeter: p = 45
Semiperimeter: s = 22.5

Angle ∠ A = α = 44.99879550462° = 44°59'53″ = 0.78553624722 rad
Angle ∠ B = β = 44.99879550462° = 44°59'53″ = 0.78553624722 rad
Angle ∠ C = γ = 90.00440899076° = 90°15″ = 1.57108677091 rad

Height: ha = 13.18799999664
Height: hb = 13.18799999664
Height: hc = 9.31993347402

Median: ma = 14.7366108713
Median: mb = 14.7366108713
Median: mc = 9.31993347402

Inradius: r = 3.86602755457
Circumradius: R = 9.32200000237

Vertex coordinates: A[18.64; 0] B[0; 0] C[9.32; 9.31993347402]
Centroid: CG[9.32; 3.10664449134]
Coordinates of the circumscribed circle: U[9.32; -0.00106652835]
Coordinates of the inscribed circle: I[9.32; 3.86602755457]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 135.0022044954° = 135°7″ = 0.78553624722 rad
∠ B' = β' = 135.0022044954° = 135°7″ = 0.78553624722 rad
∠ C' = γ' = 89.99659100924° = 89°59'45″ = 1.57108677091 rad

# How did we calculate this triangle?

### 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.