# 1 8 8 triangle

### Acute isosceles triangle.

Sides: a = 1   b = 8   c = 8

Area: T = 3.99221798557
Perimeter: p = 17
Semiperimeter: s = 8.5

Angle ∠ A = α = 7.16766433969° = 7°10' = 0.12550815236 rad
Angle ∠ B = β = 86.41766783015° = 86°25' = 1.5088255565 rad
Angle ∠ C = γ = 86.41766783015° = 86°25' = 1.5088255565 rad

Height: ha = 7.98443597113
Height: hb = 0.99880449639
Height: hc = 0.99880449639

Median: ma = 7.98443597113
Median: mb = 4.06220192023
Median: mc = 4.06220192023

Inradius: r = 0.47696682183
Circumradius: R = 4.00878354629

Vertex coordinates: A[8; 0] B[0; 0] C[0.06225; 0.99880449639]
Centroid: CG[2.68875; 0.33326816546]
Coordinates of the circumscribed circle: U[4; 0.25504897164]
Coordinates of the inscribed circle: I[0.5; 0.47696682183]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 172.8333356603° = 172°50' = 0.12550815236 rad
∠ B' = β' = 93.58333216985° = 93°35' = 1.5088255565 rad
∠ C' = γ' = 93.58333216985° = 93°35' = 1.5088255565 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.