# 14 14 18 triangle

### Acute isosceles triangle.

Sides: a = 14   b = 14   c = 18

Area: T = 96.51442476529
Perimeter: p = 46
Semiperimeter: s = 23

Angle ∠ A = α = 49.99547991151° = 49°59'41″ = 0.87325738534 rad
Angle ∠ B = β = 49.99547991151° = 49°59'41″ = 0.87325738534 rad
Angle ∠ C = γ = 80.01104017697° = 80°37″ = 1.39664449467 rad

Height: ha = 13.78877496647
Height: hb = 13.78877496647
Height: hc = 10.72438052948

Median: ma = 14.52658390463
Median: mb = 14.52658390463
Median: mc = 10.72438052948

Inradius: r = 4.19662716371
Circumradius: R = 9.13985471208

Vertex coordinates: A[18; 0] B[0; 0] C[9; 10.72438052948]
Centroid: CG[9; 3.57546017649]
Coordinates of the circumscribed circle: U[9; 1.5855258174]
Coordinates of the inscribed circle: I[9; 4.19662716371]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 130.0055200885° = 130°19″ = 0.87325738534 rad
∠ B' = β' = 130.0055200885° = 130°19″ = 0.87325738534 rad
∠ C' = γ' = 99.99895982303° = 99°59'23″ = 1.39664449467 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.