Linked from
The 23 pages that link to Riemannian metric, each with the reason it gives.
GeodesicRelated: The metric determines which paths count as geodesics.
Tangent spaceRelated: It measures lengths and angles of tangent directions.
Gauss–Bonnet theoremRelated: A metric supplies the lengths and curvature integrated by the theorem.
Levi-Civita connectionRelated: It is the geometric data the connection preserves.
Bilinear formRelated: Each tangent space carries a bilinear form that defines lengths and angles.