Trigonal Pyramidal Bond Angle

Why is the triangular-pyramid molecular binding angle smaller than the triangular-planar molecular binding angle?

The angles of the molecules in a triangular pyramid are smaller than the angles of the molecules in a plane because they have a pair that repel the other bonds, unlike molecules in a plane that have bonds but do not have a pair. :)

Angle of the triangle plane

Pyramid molecule

Trigonal Pyramidal Bond Angle

Trigonal Pyramidal Bond Angle

Why is the angle of triangular-pyramidal molecular bond smaller than the angle of triangular-planar molecular bond?

Triangular angled molecules are smaller than molecules in a triangular plane because they have a pair that repel the other bonds. Unlike molecules in a triangular plane that have bonds but do not have a pair. :)

Triangle angle

Trigonal Pyramidal Bond Angle