1 7 7 triangle

Acute isosceles triangle.

Sides: a = 1   b = 7   c = 7

Area: T = 3.49110600109
Perimeter: p = 15
Semiperimeter: s = 7.5

Angle ∠ A = α = 8.19220875163° = 8°11'32″ = 0.14329788998 rad
Angle ∠ B = β = 85.90439562418° = 85°54'14″ = 1.49993068769 rad
Angle ∠ C = γ = 85.90439562418° = 85°54'14″ = 1.49993068769 rad

Height: ha = 6.98221200219
Height: hb = 0.99774457174
Height: hc = 0.99774457174

Median: ma = 6.98221200219
Median: mb = 3.57107142143
Median: mc = 3.57107142143

Vertex coordinates: A[7; 0] B[0; 0] C[0.07114285714; 0.99774457174]
Centroid: CG[2.35771428571; 0.33224819058]
Coordinates of the circumscribed circle: U[3.5; 0.25106402059]
Coordinates of the inscribed circle: I[0.5; 0.46554746681]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 171.8087912484° = 171°48'28″ = 0.14329788998 rad
∠ B' = β' = 94.09660437582° = 94°5'46″ = 1.49993068769 rad
∠ C' = γ' = 94.09660437582° = 94°5'46″ = 1.49993068769 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    