It is pyramidal in shape.It has a lone pair.
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A trigonal planar molecule such as sulfur trioxide (SO3) or boron trihydride (BH3) has a trigonal planar shape. Trigonal pyramidal molecules such as ammonia (NH3) have bond angle closer to 107 degrees.
Trigonal Pyramidal. It is not trigonal planar because there is one lone pair around the central atom, just like the shape of ammonia.
Trigonal Pyramidal
Trigonal Pyramidal
The shape of NF3 is trigonal pyramidal because Flourine bonds to nitrogen three times leaving nitrogen with a left over bond pair of electrons.