# 3 4 4 triangle

### Acute isosceles triangle.

Sides: a = 3   b = 4   c = 4

Area: T = 5.56221488653
Perimeter: p = 11
Semiperimeter: s = 5.5

Angle ∠ A = α = 44.04986256741° = 44°2'55″ = 0.7698793549 rad
Angle ∠ B = β = 67.9765687163° = 67°58'32″ = 1.18663995523 rad
Angle ∠ C = γ = 67.9765687163° = 67°58'32″ = 1.18663995523 rad

Height: ha = 3.70880992435
Height: hb = 2.78110744327
Height: hc = 2.78110744327

Median: ma = 3.70880992435
Median: mb = 2.91554759474
Median: mc = 2.91554759474

Inradius: r = 1.01112997937
Circumradius: R = 2.15774395599

Vertex coordinates: A[4; 0] B[0; 0] C[1.125; 2.78110744327]
Centroid: CG[1.70883333333; 0.92770248109]
Coordinates of the circumscribed circle: U[2; 0.8099039835]
Coordinates of the inscribed circle: I[1.5; 1.01112997937]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 135.9511374326° = 135°57'5″ = 0.7698793549 rad
∠ B' = β' = 112.0244312837° = 112°1'28″ = 1.18663995523 rad
∠ C' = γ' = 112.0244312837° = 112°1'28″ = 1.18663995523 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.