Dimensions

The guitar's arm is 65cm long. And 5cm wide.

The guitar's body has a width  of 38cm. and a thickness of 10 cm.

Each string, on the arm, has a length of 70 cm.

The guitar's hole has a diameter of 10cm.

I think that know, how describe dimensions is essential to my life because I use this vocabulary all the time.

This will be very good in my future life.