180 degrees
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180 degrees or pi radians.
In Euclidean 3-space: a triangle (3 sides)
equilateral triangle (and so, if it is in Euclidean (plane) space, it has 3 angles all of which are 60°) otherwise (in Hyperbolic or Spherical space) it is an isosceles triangle.
In Euclidean geometry, 180. Other answers are possible, depending on the surface on which the triangle is drawn.
For the equilateral triangle in Euclidean space(i.e, the triangles you see in general) median is the same as its altitude. So, both are of equal length.