# 3 26 26 triangle

### Acute isosceles triangle.

Sides: a = 3   b = 26   c = 26

Area: T = 38.93550420573
Perimeter: p = 55
Semiperimeter: s = 27.5

Angle ∠ A = α = 6.61547243593° = 6°36'53″ = 0.11554487192 rad
Angle ∠ B = β = 86.69326378203° = 86°41'34″ = 1.51330719672 rad
Angle ∠ C = γ = 86.69326378203° = 86°41'34″ = 1.51330719672 rad

Height: ha = 25.95766947048
Height: hb = 2.99550032352
Height: hc = 2.99550032352

Median: ma = 25.95766947048
Median: mb = 13.17219398723
Median: mc = 13.17219398723

Inradius: r = 1.41658197112
Circumradius: R = 13.02216887721

Vertex coordinates: A[26; 0] B[0; 0] C[0.17330769231; 2.99550032352]
Centroid: CG[8.72443589744; 0.99883344117]
Coordinates of the circumscribed circle: U[13; 0.75112512753]
Coordinates of the inscribed circle: I[1.5; 1.41658197112]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 173.3855275641° = 173°23'7″ = 0.11554487192 rad
∠ B' = β' = 93.30773621797° = 93°18'26″ = 1.51330719672 rad
∠ C' = γ' = 93.30773621797° = 93°18'26″ = 1.51330719672 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.