# 1 28 28 triangle

### Acute isosceles triangle.

Sides: a = 1   b = 28   c = 28

Area: T = 13.99877676792
Perimeter: p = 57
Semiperimeter: s = 28.5

Angle ∠ A = α = 2.04663866074° = 2°2'47″ = 0.03657161841 rad
Angle ∠ B = β = 88.97768066963° = 88°58'37″ = 1.55329382348 rad
Angle ∠ C = γ = 88.97768066963° = 88°58'37″ = 1.55329382348 rad

Height: ha = 27.99655353583
Height: hb = 10.9998405485
Height: hc = 10.9998405485

Median: ma = 27.99655353583
Median: mb = 14.01878457689
Median: mc = 14.01878457689

Inradius: r = 0.49111497431
Circumradius: R = 14.00222326768

Vertex coordinates: A[28; 0] B[0; 0] C[0.01878571429; 10.9998405485]
Centroid: CG[9.33992857143; 0.33332801828]
Coordinates of the circumscribed circle: U[14; 0.25500398692]
Coordinates of the inscribed circle: I[0.5; 0.49111497431]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 177.9543613393° = 177°57'13″ = 0.03657161841 rad
∠ B' = β' = 91.02331933037° = 91°1'23″ = 1.55329382348 rad
∠ C' = γ' = 91.02331933037° = 91°1'23″ = 1.55329382348 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.