It is pi/10 radians ( = 36 degrees).
If the 58°-angle is one of the base angles, then the vertex angle is 64°.If the 58°-angle is the vertex angle, then the vertex angle is 58°.
It is: 180-vertex angle = exterior angle
If each base angle is 56°, then the vertex angle is 68°.If both base angles combined total 56°, then the vertex angle is 124°.
A solid angle, measured from a vertex, is the ratio between the area subtended by the angle at the vertex and the the square of the distance to the vertex. The unit of measurement is the stradian.
Two ray vertex
the vertex of the angle
If that '56' has units of 'degrees', then the vertex angle is 68 degrees.
Only if the vertex angle being bisected is between the sides of equal length will the result be two congruent triangles.
Very rarely.
80 degrees
Because the vertex is always in the same spot and its not the length of the line but the distance between the two lines that make the angle measure
You cannot build a platonic solid with six equilateral triangles meeting at each vertex because the angles of equilateral triangles do not allow for a closed three-dimensional shape at that vertex. Each angle of an equilateral triangle is 60 degrees, and six triangles would sum to 360 degrees, which does not leave room for a vertex in three-dimensional space. In contrast, the only platonic solids possible with equilateral triangles are the tetrahedron (3 triangles per vertex) and the octahedron (4 triangles per vertex).