Answer:
Viola da gamba
Step-by-step explanation:
The instrument that is shaped like half a pear is the Viola da gamba. The Viola da gamba is a string instrument that was popular in the Renaissance and Baroque periods. It is similar to the modern cello but has a different shape, with a smaller and narrower body that resembles half a pear.
The Viola da gamba is played by being held between the legs (hence the name "gamba," which means "leg" in Italian). It has six strings and is played with a bow, similar to a violin or cello.
The other options listed, Нагр, Lute, and Fretboard, are not shaped like half a pear. Нагр is not a musical instrument, Lute is a string instrument with a different shape, and Fretboard is a part of a string instrument, not an instrument itself.